(i'll mark brainiest for most detailed answer! ) which of the following best describes what happens when the atp synthase molecule opens? a. hydrogen ions move into the thylakoid and enter the hydrogen ion pump. b. hydrogen ions move into the thylakoid, exciting an electron and beginning the electron transport chain. c. hydrogen ions rush out of the thylakoid, powering the reaction that produces atp d. hydrogen ions rush out of the thylakoid, causing the electron transport chain to stop.