Which One of the Following Teachers Provides the Best Example

Which one of the following teachers provides the best example of the halo effect?

A) Mr.Urquhart overrates Cathy's gymnastic skills because she is head cheerleader.
B) Ms.Rabinowitz believes that all students can learn calculus if they study hard enough.
C) Mr.Gregg likes Frank better than Mark because Frank is more polite than Mark.
D) Ms.Noonan always gives her students the benefit of the doubt when they earn test scores close to her cutoffs for various grades.