Acid rain:
$(a)$ Causes necrosis
$(b)$ Converts chlorophyll-$a$ into phaeophytin
$(c)$ Responsible for formation of $PAN$

• A
  Only $(a)$ and $(b)$ are correct
• B
  Only $(b)$ and $(c)$ are correct
• C
  Only $(a)$ is correct
• D
  Only $(c)$ is correct