Answer:
A. 2√3.
Step-by-step explanation:
If we drop a perpendicular line from one of the vertices to the opposite side it will form 2 right angled triangles ( 30 - 60 - 90 degrees).
The ratio of the sides of these triangles is 2:1:√3 where 2 is the hypotenuse and √3 is the altitude.
So here the hypotenuse is 4 (2*2) so the altitude is 2*√3.
