What is the site of $C_{3}$ cycle in $C_{3}$ and $C_{4}$ plants?

• A
  In $C_{3}$ plants $-$ mesophyll cells and in $C_{4}$ plants $-$ bundle sheath cells.
• B
  In $C_{3}$ plants $-$ bundle sheath cells and in $C_{4}$ plants $-$ mesophyll cells.
• C
  In $C_{4}$ plants $-$ bundle sheath cells and in $C_{3}$ plants $-$ bundle sheath cells.
• D
  In $C_{3}$ plants $-$ mesophyll cells and in $C_{4}$ plants $-$ mesophyll cells.