Solve the Problem $$h = - 10 t ^ { 2 } + 320 t$$

Multiple Choice

Solve the problem.
-A projectile is thrown upward so that its distance above the ground after t seconds is $$h = - 10 t ^ { 2 } + 320 t$$ After how many seconds does it reach its maximum height?

A) 32 s
B) 16 s
C) 8 s
D) 24 s