The speaker drew examples copiously from various books.

A. largely

B. continuously

C. plentiful

D. completely

Answer: Option C

Solution(By Examveda Team)

Largely : to a great extent; on the whole; mostly.
Continuously : without interruption or gaps.
Plentiful : existing in or yielding great quantities; abundant.
Completely : totally; utterly.
Copiously : in large quantities.

Synonym of Copiously is Plentiful