[Daryl]

I will say B
the left hand is about 18 inches away from center and the left arm is at about a 20* angle

I was afraid of that (now I have to write this long answer ), but the answer is A. This may be the root of your issue about keeping the Clubshaft On-Plane during the backswing. Your power Package has move away from an "in front" of body position. You have a broken Triangle. Substitute your right arm for a towel placed in your left arm pit at one end and held in your right hand at address position in the other with the towel pulled taught. Keep pulling on the towel while testing how far you can move your right hand away from center. How far can you move your right hand now?

Swingers version of the RFT.

Notice, from an Adjusted Address position and without a Club, that you can move your hands (pretend you're gripping a Club) to the right almost any distances identified in the answers A through D (without Extensor Action). Also, keep in mind that you can create almost any Path away from the ball. You can move your hands away in front of you or pull them behind you or make them go straight back away from you. And, you can make them travel Backward, Inward and Upward simultaneously. However, the RFT is a special way.

To get the feel and visually see the procedure you'll need a chair (like a folding chair) that has a back about as high as your hips. Stand behind the chair and assume an Adjusted Address posture (without a club) so that the butt end of your Left Hand lies on the face of the chair back. Using light Extensor Action pressure (#1 PP), push down gently so that your Left Wrist Flattens and your Right Wrist Bends. If your Left Wrist Arches slightly, then you're pushing in the wrong direction. Push gently down in the direction of your left arm. Once you accomplish the Flat Left Wrist, then Turn your hands a little to the right without letting the butt end of the Left Hand come off the back of the chair back (it will rock to the right and stay on the back of the chair). So the back of the right hand needs to move a little toward the back of the chair as you rotate. It's only a slight rotation. If you had a Club in your hands the Clubhead would only have traveled about two feet and the Clubshaft still points toward the base line of the inclined plane.

Next, slide your hands to the right a few more inches while continuing to turn your hands until your hands are in the line of sight to your right foot. Because your hands are simultaneously moving and Turning slightly to the right, they appear to only turn slightly more. That's the RFT. You have structure. Your right forearm has become fanned opened. You reestablished the flying wedges and turned your hands.

At this point, the end of the RFT you should have created enough structure so that any further motion will start your shoulders to turn. Continue to the Top or End, whichever is your procedure and you should have accomplished a TSP.

But, and this is the TGM fun part, the RFT should be accomplished with Extensor Action alone. Train you extensor action to complete this procedure in one simple move integrated seamlessly into the backswing.