Please choose the correct answer to the question: A scientist was investigating why several fish caught from a local stream displayed similar mutations. He found that the water temperature of the stream was elevated since an industrial plant began discharging heated water into the stream. The scientist concluded that increased water temperature during the egg phase led to the mutation in the fish. According to this conclusion, the mutation was caused by

Answer1: an autoimmune disorder. Answer2: a congenital defect. Answer3: an environmental condition. Answer4: an injury from a predator.

Answer format: answer1/answer2/answer3/answer4
Answer: answer3