Electric dipole in a uniform field

2012 AIPMT-PRE 1 question

1. 1 Electric Charges and Fields
   An electric dipole of moment 'p' is placed in an electric field of intensity 'E'. The dipole acquires a position such that the axis of the dipole makes an angle $\theta$ with the direction of the field. Assuming that the potential energy of the dipole to be zero when $\theta = 90^\circ$, the torque and the potential energy of the dipole will respectively be
   A $pE\cos\theta$, $-pE\sin\theta$ B $pE\sin\theta$, $-pE\cos\theta$ C $pE\sin\theta$, $-2pE\cos\theta$ D $pE\sin\theta$, $2pE\cos\theta$
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