If the angle of elevation of a tower from a distance of 100 metres from its foot is 60?, the height of the tower is

• A. $100\sqrt 3 \,m$$
• B. $\frac{{100}}{{\sqrt 3 }}\,m$$
• C. $50\sqrt 3 \,m$$
• D. $\frac{{200}}{{\sqrt 3 }}\,m$$