Question

Which sentence displays proper use of commas and correct parallel structure?
A) To bike, swimming, and hiking are my three favorite outdoor activities.
B) To bike, swimming, and hiking, are my three favorite outdoor activities.
C) To bike, to swim, and to hike are my three favorite outdoor activities.
D) To bike, to swim, and to hike, are my three favorite outdoor activities.

Answer 1

I think it is answer D
 I may be wrong 

Answer 2

I would best go with choice C) or the third option because it doesn't have a misuse of commas.