Answer:
a. acute stress reaction
Step-by-step explanation:
Acute stress reactions are one of the most common reactions associated to stress. They are experienced as the result of an immediate perceived threat (that can be either physical, emotional or psychological).
In this example, your partner has a particularly disturbing call and the next day he is angry and having a difficult time concentrating on his work. We can see that he experienced a immediate threat (the disturbing call) and he is reacting to it the next day, therefore, this could be an example of acute stress reaction.