An electric dipole has a fixed dipole moment `vec(p)`, which makes angle `theta` with respect to x-axis. When subjected to an electric field `vec(E_(1)) = E hat(i)`, it experiences a torque `vec(T_(1)) = tau hat(k)`. When subjected to another electric field `vec(E_(2)) = sqrt(3) E_(1) hat(j)`, it experiences torque `vec(T_(2)) = -vec(T_(1))`. The angle `theta` is
A. `90^(@)`
B. `30^(@)`
C. `45^(@)`
D. `60^(@)`
