Swimming is an action verb because you can do it. Fast is not an action verb it is an adjective.
The best and most correct answers among the choices provided by the question are the fourth choice "Then, as we breathe more freely in the clear space that we have made for ourselves, we grow aware that we must not relax our vigilance." and the eighth choice "<span>To think one could not even then be clear of things, and make at least a fresh start! That must, indeed, have been in the childhood of the race." </span>I hope my answer has come to your help. God bless and have a nice day ahead!
C it resolves the main conflict of the story
The theme i guess is explaining how he is helping a butterfly.