If a Mutant Plant Were Created That Lacked the Receptor

If a mutant plant were created that lacked the receptor for ethylene, its leaves would

A) not expand as much as wild-type leaves.
B) be unable to turn green in the spring.
C) produce excess cytokinins to compensate for the missing ethylene response.
D) be unable to undergo abscission in the fall.
E) develop prematurely in the spring.