The correct option is D TP = OP
DPD stands for diffusion pressure deficit. When more than one solutions are placed in contact, water moves from a region of low DPD to a region of high DPD. The value of DPD is calculated as the algebraic difference of osmotic pressure (OP) and turgor pressure (TP). In a fully turgid cell OP and TP are equal and hence, DPD is equal to zero.