Why is it important that hydrogen ions are continually released to the outside of the mitochondrion as electrons are moved through the electron transport chain? Multiple choice question.

A)
Hydrogens outside of the mitochondrion attract electrons and deliver them to transport proteins in the electron transport chain. More external hydrogen ions can attract more electrons.

B)
Mitochondria must create and maintain a proton gradient, where the higher concentration of external hydrogen ions will cause the protons to move back through ATP synthase in attempt to balance the gradient.

C)
Oxygen can’t be oxidized if there are hydrogen ions inside the mitochondrion, so the ions must be exported to allow oxygen to act as the final electron acceptor.

D)
Hydrogen ions must remain in high concentration outside of the mitochondrion to attract electrons to the end of the electron transport chain.

E)
Cells must maintain an equal concentration of hydrogen ions inside and outside the mitochondria to synthesize ATP.

PLS HELP q-q

(me out over the last several centuries, scientists have made the following broad observations while investigating several branches of the life sciences: -the fossil record shows that different types of organisms have existed at different times in earth's history. -many organisms have similar body structures that seem to be adapted to different ways of living in their environment. -organisms of different species often share similarities in stages of embryonic development. -many species share genetic similarities, and almost all organisms use the same basic building blocks to construct proteins. -often, the extent of two species' similarities can be predicted from their geographic closeness to each other. -a great deal of change has been observed among species that have experienced strong selective pressures through many generations. scientists have carefully considered and rigorously tested the observations listed above. when scientists offer a of these observations, they are making 1.) testable explanation, deductive explanation 2.) scientific interference, scientific law