Consider the following statements and choose the correct answer:
1. The immediate precursor of gibberellin is the diterpene kaurene
2. The gibberellins are compounds consisting of the ent-gibberellane skeleton or ent-20 norgibberellane
3.The gibberellins are easily inter-convertible in the organism by changes in the hydroxyl substitutions

A. 1, 2 and 3 are true

B. Only 2 and 3 are true

C. Only 1 is true

D. Only 3 is true

Answer: Option A