Assertion :- Old woody plant parts are devoid of primary phloem.
Reason :- Primary phloem gets crushed due to continuous formation and accumulation of secondary xylem.
A. If both Assertion & Reason are True & Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but the Reason is a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are false.