Which Mutation Would Most Likely Damage a Plant's Ability to Respond

Multiple Choice

Which mutation would most likely damage a plant's ability to respond to light or to gravity?

A) A mutation that reduced activity of the proton pump
B) A mutation that enhanced activity of the proton pump
C) A mutation that disabled movement of ubiquitin
D) A mutation that changed the absorption spectrum for phototropin
E) A mutation that disabled movement of the auxin anion efflux carriers