An electric dipole of moment \[\vec{p}\] is lying along a uniform electric field \[\vec{E}\]. The work done in rotating the dipole by \[{{90}^{o}}\] is. [AIPMT (S) 2006]

• A. \[\sqrt{2}\,pE\]
• B. \[\frac{pE}{2}\]
• C. \[2\text{ }pE\]
• D. pE