Which of the following is correct ? (a) Coal is referred to as "Buried Sunshine" as it was formed millions of years ago when organic matter got buried under the layers of earth. (b) Petroleum and its derivatives are called "Black Gold" as they are very valuable.

• A. (a) is correct (b) is not
• B. (b) is correct (a) is not
• C. Neither (a) nor (b) is correct
• D. both (a) and (b) are correct