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No

relative to what?

even though I am now relatively stationary to the ground (sitting), am I still accelerating?

Quote from: TheBoxeven though I am now relatively stationary to the ground (sitting), am I still accelerating?Yes. The seat is applying a force to your backside, which is accelerating you upwards (F=ma, as per Newton).This upwards acceleration exactly counteracts your natural tendency (in an inertial frame) to plunge towards the center of the Earth in an elliptical orbit.

The cushions on your sofa are not flat like pancakes and are resisting gravity. When you sit they exert a force on you that is equal and opposite to the force you exert on them.

presently we think B, why not A and C?

PS: Congratulations! This must be about the most relevant and comprehensible diagram I have seen you sketch -

The arrows in your diagrams could be considered to be vectors. Which have a magnitude and direction. This leads nicely into linear algebra.

I started here in learning

Quote from: TheBoxI started here in learningThe Khan academy is a good place to learn stuff!Try some mathematics classes about drawing graphs. Do they have some about drawing scientific diagrams? The most recent set of diagrams and equations has returned to the usual standard. []