(A) : The series of organisms eating one another form the food chain.
(R) : A food chain begins when a predator eats on a prey.
A. If both (A) and (R) are true but (R) is not the correct explanation of (A).
B. If both (A) and (R) are true and (R) is the correct explanation of (A).
C. If (A) is true but (R) is false.
D. If both (A) and (R) are false.