If Vector a Makes an Angle Of $\theta$ With Respect to the X Axis and A_x is Given

Multiple Choice

If vector A makes an angle of $\theta$ with respect to the x axis and A_x is given in a two-dimensional rectangular coordinate system, then |A| is equal to A_x times

A) sin $\theta$ .
B) l/(sin $\theta$ ) .
C) tan $\theta$ .
D) l/(cos $\theta$ ) .