No1. Fall down in that sense means to lag in performance, whereas fall though means to fail.
No2. c. disclose sounds right to me too.
No3. Both sound kind of off to me, a. vibrant more so than b. energetic. To me, the latter refers to color, whereas energetic can and does refer to life; e.g., The city is full of energy; it's energetic with life. It still sounds odd, but not ungrammatical. Could be just me.
All the best.![]()




