Which of these people is experiencing stress

If you are looking from the following possible choices:

A) Brian has recently had to take care of his ailing grandma and his grades have slipped. Ne has become very moody and gets angry very quickly
B) Gia like to spend her days doing nothing and get angry when her mom asks her to clean her room or do some other chore
C) Tania is very particular about her possessions and loses her cool the moment anyone touches them

The person who most often probably experiences stress currently would be A - he gets angry faster, can be agitated faster etc. These are clear signs of stress.