The Answer is A because its was drawn down to exposition so its a exposition
The word closest in meaning to copious is b - plentiful.
Copious is synonyms to bountiful and bountiful means abundance, plenty, overflowing and never lacking anything. The other choices are really different since all of it has the common ground in meaning which is opposite to the given word.
An allusion is <span>an expression designed to call something to mind without mentioning it explicitly; an indirect or passing reference.</span>
So that the reader can under stand the way the weighted is explaning
