Girl I’m not writing an essay for you so start typing sis
Very
Very is the adverb that is modifying another adverb. In this sentence, the adverbs are usually, quickly, very, and carefully. Usually modifies the verb moves telling how often he moves the eggs. Quickly and carefully both modify the verb moves as well. They describe how he moves - quickly and carefully. Very is an adverb that clarifies how carefully the speaker is moving.
The topic sentence is usually found at the beginning of the paragraph
The answer is B. exposition, the exposition gives info on the story and background characters before the plot takes place.