$A$ tower stands on a horizontal plane. $A$ man on the ground $100 \ m$ from the base of the tower finds the angle of elevation of the top of the tower to be $30^{\circ}$. What is the height of the tower (in $m$)?
- A$100$
- B$100 \sqrt{3}$
- C$\frac{100}{\sqrt{3}}$
- DNone of these
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