In photosystem $II$, the reaction centre chlorophyll-a absorbs $A$ nm wavelength of red light, causing electrons to become excited and jump into an orbit farther from the atomic nucleus. These electrons are picked up by an $B$, which passes them to an electron transport system consisting of $C$. Pick the right choice for $A, B$ and $C$.

• A
  $A-680 \; nm, B-\text{electron donor}, C-\text{cytochromes}$
• B
  $A-780 \; nm, B-\text{electron acceptor}, C-\text{cytochromes}$
• C
  $A-680 \; nm, B-\text{electron acceptor}, C-\text{cytochromes}$
• D
  $A-780 \; nm, B-\text{electron donor}, C-\text{cytochromes}$