What Powers the Movement of Proteins into the Mitochondrial Matrix

Multiple Choice

What powers the movement of proteins into the mitochondrial matrix?

A) electric potential across the inner mitochondrial membrane acting on the positively-charged targeting signal
B) electric potential across the outer mitochondrial membrane acting on the positively-charged targeting signal
C) ATP
D) GTP
E) electric potential across the inner mitochondrial membrane acting on the negatively-charged targeting signal