He is planning the windmill
Answer: to try to make yourself feel confident and ready to do something difficult:
Explanation:
The correct answer is ( A )
This article is about an invention called ReWalk uses robotic pants with sensors and motors to allow people in wheelchairs to walk. The other statements (B), (C) and (D) are secondary ideas which expand the main concept or thesis statement.
D is a run-on on sentence. Hope that helped! :)