Which Activity Below Is NOT Thought to Be Driven by the Proton-Motive

Which activity below is NOT thought to be driven by the proton-motive force?

A) formation of the spindle
B) ADP and inorganic phosphate uptake into the mitochondrion in exchange for ATP and H⁺, respectively
C) uptake of Ca²⁺ ions into the mitochondrion
D) the events of mitochondrial fusion
E) uptake of specifically targeted proteins into the mitochondrion from the matrix