Solve the Problem $B$ And the Height $h$ Of a Pyramid Are Related to the Pyramid's Volume

Solve the problem.
-The area of the base $B$ and the height $h$ of a pyramid are related to the pyramid's volume $V$ by the formula $\mathrm { V } = \frac { 1 } { 3 } \mathrm { Bh }$ . How is $\mathrm { dV } / \mathrm { dt }$ related to $\mathrm { dh } / \mathrm { d }$ t if $\mathrm { B }$ is constant?

A) $\frac { \mathrm { dV } } { \mathrm { dt } } = \frac { \mathrm { B } } { 3 } \frac { \mathrm { dh } } { \mathrm { dt } }$
B) $\frac { d V } { d t } = B \frac { d h } { d t }$
C) $\frac { \mathrm { dV } } { \mathrm { dt } } = \frac { \mathrm { dh } } { \mathrm { dt } }$
D) $\frac { \mathrm { dV } } { \mathrm { dt } } = \frac { 1 } { 3 } \frac { \mathrm { dh } } { \mathrm { dt } }$