A Water Tank Is Constructed in the Shape of a Sphere

Multiple Choice

A water tank is constructed in the shape of a sphere seated atop a circular cylinder.If water is being pumped into the tank at a constant rate, let $h(t)$ be the height of the water as a function of time.For the interval a < t < b, which of the following is true?

A) $h(t)$ is concave down
B) $h(t)$ is linear
C) $h(t)$ is concave up