Read the following statements and answer the following question.
A@B means A is the mother of B
A#B means A is the father of B
A$B means A is the brother of B
A%B means A is the sister of B

Which of the following shows that 'P is the grandmother of R' ?

A

P#Q#R

B

P#Q@R

C

P@Q@R

D

P%Q#R