CLAT 2011 Question Paper with answer key for online practice

In the following question, there are two or more statements along with few conclusions deduced from the statements. You are required to answer on the basis of the statements and the conclusions. Make the factual assumptions required by the question even if you believe the statement is actually false.
Statement 1: All whales are fish.
Statement 2: Some fish are not amphibians.
Statement 3: All whales are amphibians.
Statement 4: Some amphibians are not fish.
Conclusions:
(a) Some fish are amphibians.
(b) Some amphibians are fish.
(c) Only whales are both fish and amphibians.
(d) All amphibians are fish.
Assuming the statements 1, 2, 3 and 4 are true, which conclusion follows: