While India's Human population is growing at an astounding pace, the bird population is shrinking fastly mainly because:

1. there has been an abnormal increase in the number of hunters.
2. bio-pesticides and organic manure are being used on an large scale.
3. there has been a large scale reduction in the habitats of the birds.
4. there has been a large scale used of pesticides, chemical fertilizers and mosquito repellents.

Select your answer correctly using the codes given below:
Codes:

A) 1 and 2 are correct

B) 2 and 3 are correct

C) 3 and 4 are correct

D) 1 and 4 are correct

This MCQ is part of the UP PSC Previous Year Questions (PYQs) series, focusing on UPPSC Prelims 2001 (GS Paper I)