Final answer:
Chronic stress reaction is not a recognized type of stress reaction for EMTs, unlike acute, delayed, and cumulative stress reactions.
Step-by-step explanation:
The option that is NOT a type of stress reaction an EMT may experience as a result of stressors encountered within the profession is d) Chronic stress reaction. The other options listed, such as a) Acute stress reaction, b) Delayed stress reaction, and c) Cumulative stress reaction, are recognized types of stress reactions. Acute stress reactions are immediate responses to a stressor, delayed stress reactions occur at some time after the stress event has passed, and cumulative stress reactions build up over time due to repetitive exposure to stressors. Chronic stress reaction, as described in the provided information, is not a term generally used to describe a type of stress reaction for EMTs.