Which of These Guidelines Would Not Be Used for Assigning

Which of these guidelines would not be used for assigning weighting factors for resonance forms?

A) Resonance forms must have the same number of paired and unpaired electrons.
B) Separation of charges is preferred.
C) The more bonds in a resonance form, the more stable the form is.
D) Equivalent resonance forms contribute equally.
E) Delocalization of charge is stabilizing.