Appropriate first-aid measures for dealing with carbon monoxide poisoning should not include
getting brisk exercise.
getting fresh air.
seeking medical attention.
leaving the suspected environment.

Appropriate first-aid measures for dealing with carbon monoxide poisoning should not include  "getting brisk exercise".

Option A

Explanation:

First-aid measures for preventing poisonous carbon monoxide is to expose victim in fresh air by leaving the effected environment and immediately seek for some medical emergency but never ask to follow brisk exercise.

Brisk walk or exercise is walking slowly or moving in comparatively slower speed than the atmospheric air or the exercise which is either slow or somewhat speedy for others, measured as steps per minute.

In many cases it is recommended to take hyperbaric oxygen therapy. Within a chamber the air pressure is about two to three times greater than normal, this therapy demands breathing pure oxygen. This speeds up replacing the carbon monoxide in victim's blood with oxygen.