[A] : Elephants have lophodont type of teeth.
[R]: There is an intricate folding of the enamel and dentine to form transverse ridges.
A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false