Assertion $(A)$: $-NH_2$ group of aniline is ortho,para directing in electrophilic substitutions.
Reason $(R)$: $-NH_2$ group stabilises the arenium ion formed by the ortho,para attack of the electrophile.
The correct answer is

• A
  Both $(A)$ and $(R)$ are correct,$(R)$ is the correct explanation of $(A)$
• B
  Both $(A)$ and $(R)$ are correct,$(R)$ is not the correct explanation of $(A)$
• C
  $(A)$ is correct,but $(R)$ is not correct
• D
  $(A)$ is not correct,but $(R)$ is correct