If the altitude of an equilateral triangle is \[4m\times 2m\]cm, its area is

• A.  \[625c{{m}^{2}}\]         
• B.  \[125c{{m}^{2}}\]
• C.  \[150c{{m}^{2}}\]             
• D.  \[100c{{m}^{2}}\]