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At a depth of $h$ meters below the surface, the estimated total pressure $P_1$, in kilopascals (kPa), a diver experienced is given by $P_1=10h+101$, which is a combination of estimated water pressure and estimated atmospheric pressure. After maintaining a certain depth, the diver descended $d$ additional meters. The estimated total pressure $P_2$ in kPa, the diver experienced after descending these $d$ additional meters is given by $P_2=10d+311$. Which of the following is the best interpretation of $311$ in this context?

A

The estimated total pressure, in kPa, the diver experienced at a depth of $d$ meters

B

The estimated increase in the total pressure, in kPa, the diver experienced for each increase in the depth by 1 meter

C

The estimated increase in the total pressure, in kPa, the diver experienced for each increase in the depth by $d$ meters

D

The estimated total pressure, in kPa, the diver experienced when the diver began to descend $d$ additional meters