C-C double bonds resist rotation about their C-C axis because

A) Rotation breaks the overlap of the pi orbitals which forms part of the double bond
B) The substituted groups sterically hinder each other
C) The double bond soaks up thermal energy
D) This isn't true: double C-C bonds rotate nearly as freely as single C-C bonds
E) Their configuration is locked by multiple sigma bonds formed between the two carbons