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

Multiple Choice

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

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