Answer:
b) be less skeptical than usual about the excuse.
Step-by-step explanation:
Research has shown that mood has effect on interpersonal trust, hence positive moods will generally makes an individual to be less skeptical of am excuse, story or a situation, while negative mood, has tendency to make an individual to be more skeptical of a story or excuse.
Also, research has shown that negative mood tends to process information in an accommodative, detailed and systematic manner, unlike positive mood, that processes information in an assimilative, heuristic and top down processing, hence, negative mood tends to give a better judgment of a story than positive mood.
Therefore, Professor Shackleford will be less skeptical than usual about the excuse due to her positive mood at that moment.