In the diagram shown below,label $A, B, C$. What type of phosphorylation is possible in this?

(N/A) Based on the provided diagram,the labels are as follows:
$A$: Electron acceptor
$B$: Electron transport system
$C$: Chlorophyll $P_{700}$ (Photosystem-$I$)
The process shown is cyclic photophosphorylation. In this process,electrons are excited by light and travel through an electron transport system,which releases energy to synthesize $ATP$ from $ADP$ and inorganic phosphate $(iP)$. The electrons then return to the original chlorophyll molecule $(P_{700})$,completing the cycle. Thus,the type of phosphorylation is cyclic photophosphorylation.