Correct Answer: A. Acid rain caused by air pollution
Acid rain corrodes marble, causing the "stone cancer" effect.
If you think there is any confusion in the given MCQs, you can comment below.
docmcqs.com is Pakistan's No.1 online platform for preparing for all types of exams including PPSC, FPSC, KPSC, SPSC, Ministry of Defence, and for one-paper MCQs. This includes Pedagogy MCQs, general knowledge MCQs, current affairs MCQs, and much more.