What element can be stored in limestone for millions of years?\nOptions:\n- (A) oxygen\n- (B) Energy\n- (C) matter\n- (D) carbon\n- (E) sodium\n- (F) helium\n- (G) rock salt\n- (H) heat
Step-by-step reasoning:
(D)
Carbon may be stored in sedimentary rock for millions of years.

Limestone is a type of sedimentary rock.

Carbon may be stored in limestone for millions of years.

.

Thus, the answer is (D)