Brenda Forgot to Set Her Alarm Clock, Overslept, Missed Her

Brenda forgot to set her alarm clock, overslept, missed her train, and was late to work. When she got to her office, she realized that she'd left the power adapter for her laptop at home. By afternoon, Brenda had a mountain of work on her desk and a tension headache. Brenda's high level of stress:

A) is due to her Type B behavior pattern.
B) can best be explained as the cumulative effect of daily hassles.
C) can best be explained by the social contagion effect.
D) is due to the release of the hormone oxytocin by the adrenal medulla.