Problem: Grant is usually in a fairly good mood. He smiles and says hi every time he sees someone he knows. Today, he's had a bad day - didn't get a lot of sleep, his car wouldn't start, and he failed a quiz. He passed one of his friends on the pedistrium and ignored him. Grant's friend was confused about why Grant had ignored him. What type of context included in the transactional model of communication probably explains Grant's change in behavior, as well as his friend's confusion?
A. Physical
B. Temporal
C. Cultural
D. Social-Psychological