Explanation:

Correct Answer is (d).The given statement gives the impression that people prefer clay idols but they also prefer moulded idols from other cities.
Among the given options, A is not correct since low itself gives the opposite impression to the one actually intended in the sentence.
Option B is not correct since few is not the correct word for the first blank whereas small is also not correct in option C for the first blank in the sentence. Option D is correct because both the words fit perfectly in the given sentence as high implies that the demand for clay idols is good but people are also preferring moulded idols procured from other cities.
This makes option D the correct choice among the given options.