Option C is
the correct answer because ‘sparsely’ means ‘thinly scattered’. It is described
in the sentence that one cannot find a village for miles. Thus, ‘sparsely’ is
the most appropriate word to describe the population in the hills.
Option A is incorrect because ‘heavily’ means ‘dense’. As it is mentioned in
the sentence that one cannot find a village for miles, ‘heavily’ is not the
appropriate word to complete the meaning of the sentence.
Option B is incorrect because ‘densely’ means ‘closely packed together’. It is
not the appropriate the word for this sentence because population is not dense
in the hills.
Option D is incorrect because ‘quietly’ means ‘calm’. It is not the appropriate
grammatical word for this sentence.