The reaction centre of PS I is $\mathrm{\_\_A\_\_}$and the reaction entre of PS II is ____

• A

  ${\mathrm{P}}_{680,}{\mathrm{P}}_{700.}$

• B

  ${\mathrm{P}}_{700,}{\mathrm{P}}_{680.}$

• C

  ${\mathrm{P}}_{700},{\mathrm{P}}_{780}.$

• D

  ${\mathrm{P}}_{780,}{\mathrm{P}}_{700.}$