[A] : Chloroplasts have 75% chlorophyll a and 25% chlorophyll b
[R] : Chloroplasts have 50% chlorophyll a and 50% chlorophyll b .

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