The contra positive of $$p \rightarrow (q \rightarrow r)$$ is

A

$$(q \wedge \sim r) \rightarrow p$$

B

$$(q \wedge \sim r) \rightarrow \sim p$$

C

$$(q \rightarrow  r) \rightarrow p$$

D

$$(\sim q \wedge r) \rightarrow \sim p$$