Antonio's car stalls in the middle of a railroad crossing just as a train is rapidly approaching.His emotional arousal is likely to be accompanied by

A) a decreased blood sugar level.
B) a decreased respiration rate.
C) contraction of the arteries.
D) dilation of his pupils.

When faced with a highly stressful situation like being stuck on a railroad crossing with an approaching train, the body's sympathetic nervous system is activated, leading to increased heart rate, pupil dilation, and increased respiration rate to prepare for fight or flight response. This is accompanied by an increase in blood sugar levels rather than a decrease. The arteries may also experience dilation to improve blood flow to the muscles. Therefore, out of the given options, dilation of the pupils is the best choice.