Concept:This question tests knowledge of antonyms, or words that are opposite in meaning to another word.
Explanation:The underlined word is "copious", which means abundant or plentiful in quantity or supply.
For instance, "copious rain" means a very large amount of rain.
The correct opposite must suggest little or insufficient quantity.
The word "scanty" means small, insufficient, or barely enough in amount.
Therefore, "scanty" is the most direct opposite of "copious".
Now examine the remaining options.
"Illegible" means difficult or impossible to read, so its opposite is "legible".
"Inaccurate" means not correct, so its opposite is "accurate".
"Coherent" means logical and clearly organised, so its opposite is "incoherent".
None of these options relate to quantity or amount, so only "scanty" correctly fills the gap.
Answer:A. scanty