Well, this answer can be many things! I would say "When you read carefully in order to determine the meaning of a challenging word, you are 'using context clues'", perhaps? Maybe not...how about "...using prior knowledge"? Since you didn't offer any alternative answers, or list any answers, I can only guess. I hope I helped you a little bit!
The answer would be B, word choice!
<em>the other term for this is <u /><u>sparsely populated..
</u>mean the area under observation does not have enough crowd or people... they may be audience in a cinema or public or citizens in a city...<u>
</u></em>
Noun or verb
is that what your asking?