Assertion: Productivity and yield are better in `C_(4)` plants.
Reason: `C_(4)~ plants lacks photorespiration.
A. If both assertion and reason are true and the reason 1s the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.