If Various Plant Cell Membranes Are Isolated and Incubated with a Proton

Multiple Choice

If various plant cell membranes are isolated and incubated with a proton gradient across the isolated membrane in the presence of ADP and i, which of the following samples are most likely to be able to synthesize ATP?

A) thylakoid membrane only
B) inner mitochondrial membrane only
C) thylakoid membrane and inner mitochondrial membrane
D) thylakoid membrane and plasma membrane