[A] : Mitochondria are called power houses of the cell.
[R] : Mitochondria produces ATP by the break-down of carbohydrates into carbon dioxide (of carbohydrates) and water .

Options

A. (a) If both A and R are true and R is the correct explanation of A
B. (b) If both A and R are true but R is not the correct explanation of A
C. (c) If A is true and R is false
D. (d) If both A and R are false