Solve the Problem $t$ Seconds Is $h = - 13 t ^ { 2 } + 364 t$

Multiple Choice

Solve the problem.
-A projectile is thrown upward so that its distance above the ground after $t$ seconds is $h = - 13 t ^ { 2 } + 364 t$ . After how many seconds does it reach its maximum height?

A) $14 \mathrm {~s}$
B) $28 \mathrm {~s}$
C) $21 \mathrm {~s}$
D) $7 \mathrm {~s}$