[A]: The two sperms cells in a pollen tube often change their shape.
[R]: The sperms are released in the synergid as intact cells but only their nuclei migrate
A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false
