[A] : The pyramid of biomass indicates the decrease or the gradual reduction in biomass at each trophic level from base to apex .
[R] : In case of parasites , the pyramid of biomass is inverted .

Options

A. 1)If both A and R are true and R is the correct explanation of A
B. 2)If both A and R are true but R is not the correct explanation of A
C. 3)If A is true and R is false
D. 4)If both A and R are false