This protein allows H+ ions to pass through the thylakoid membrane

protein ATP synthase

the membrane provides the energy to make ATP. H+ ions cannot directly cross the thylakoid membrane. The protein ATP synthase allows H+ ions to pass through it. As H+ ions pass through ATP synthase, it rotates & the energy is used to bind ADP & a phosphate group together to produce ATP.

option a and d is the correct answer

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