very simple ....:):):)

if a function f(x) is defined in [-1,1] and two vertices of an equilateral triangle are (0,0) and (x,g(x)) and it's area is √3/4, then g(x) is

A,√(1+x²)
B.-√(1+x²)
C.√(1-x²)
D. none of these

actually i am not getting the question itself ...i feel something is missing out there ...can somebody guess by taking a look at the options ?if there is no mistake please explain the question also !!:) :) :)