Plant hormones produce their effects by A) altering the ...

[xclash]

Plant hormones produce their effects by
A) altering the expression of genes.
B) modifying the permeability of the plasma membrane.
C) modifying the structure of the nuclear envelope membrane.
D) altering the expression of genes and modifying the permeability of the plasma membrane.
E) modifying the permeability of the plasma membrane and modifying the structure of the nuclear envelope membrane.

[clippers!]

I chose D and got the answer, hope that helps.