How many of the following of mitochondrial inner membrane not only involved as electron carriers but also as proton pumps during electron transport of aerobic respiration of plants?A. Complex I                B. Complex II                  C. Complex III                                  D. Complex IVE. Complex V

Complex I, Complex III and Complex IV carry not only electrons but also pump protons from matrix to perimitochondrial space. Complex II is only electron carrier but not protons. Complex V is involved in oxidative phosphorylation and transports protons by facilitated diffusion from perimitochondrial space to matrix.