A. Photosynthestically C4 plants are less efficient then C3 plants.R. The operaion of C4 pathway requires the involvement of only bundle-sheath cells.

• A. If Assertion (A) and reason (R) both are correct and R is explanation to A.
• B. If (A) and (R) both are correct but (R) is not an explanation to A.
• C. If A is true but R is false.
• D. If both A and R are false.