The ending -tion creates the noun form of many verbs ending in

you didn't list the options but im guessing it's resolving contradictions

it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.

i don't know sorry i cannot read a novel in 30 min.

explanation:

but just in case i think the answer is b.