Problem $5\mathrm{.}14$

A projectile is fired with a velocity of $100\mathrm{.}3\frac{m}{sec}$ at an inclination of $60$ with respect to the surface. The time $(sec)$ required by the projectile to reach the height of $100m$ from ground while returning is most nearly:

A$.1\mathrm{.}24$

B$.16\mathrm{.}5$

C$.7\mathrm{.}86$

D$.19\mathrm{.}32$