Assertion (A): Coal, petroleum and natural gas be prepared in the laboratory from dead organisms. Reason (R): They cannot be prepared in laboratory as their formation is a very slow process and conditions for their formation cannot be created in the laboratory.

• A.  A is correct and R is the correct explanation of A.
• B.  A is correct and R is not the correct explanation of A
• C.  A is correct and R is wrong.
• D.  A is wrong and R is correct.