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.Gregg likes Frank better than Mark because Frank is the more polite of the two students.
B) Ms.Noonan always gives her students the benefit of the doubt when they exhibit "borderline" test performance.
C) Mr.Urquhart overrates Cathy's gymnastic skills because she is head cheerleader.
D) Ms.Rabinowitz believes that all students can learn calculus if they study hard enough.