The Height (In Feet) Attained by a Rocket T Sec

The height (in feet) attained by a rocket t sec into flight is given by the function . When is the rocket rising and when is it descending?

A) The rocket is rising on the interval (0,17) and it is descending on the interval (17, t) where t is some positive number more than 17.
B) The rocket is rising on the interval (0,58) and it is descending on the interval (58, t) where t is some positive number more than 58.
C) The rocket is rising on the interval (0,21) and it is descending on the interval (21, t) where t is some positive number more than 21.
D) The rocket is rising on the interval (0,45) and it is descending on the interval (45, t) where t is some positive number more than 45.