-ily makes and adverb (speddily, hastily,etc)
-ible makes and adjective (fallible,incorrigible, etc)
-ity makes a noun (pity, identity)
-ate makes a verb (elongate, interrigate, etc)
A, the word option means a choice or an alternative.
A, though I don't know what the passage says you can assume he kept going because he was determined and the rest don't give a good enough reason to leave his friend.
C. simile is a comparison using like or as
Standard default , C
I hope this helps! :)