10. Which describes an effect of stress on the respiratory system? It can trigger muscle tension.
O It can trigger an asthmatic attack.
.
It can stimulate the need for caffeine.
O It can increase blood pressure.

It can trigger muscle tension which may trigger an asthmatic attack as respiratory system is about breathing and asthma might make it hard to breathe unless you have an inhaler. Blood pressure have nothing to do with respiratory system as it falls under circulatory system.

the correct answer is 4 (giveaways to the public)

something that is given away or gave out for free. an occasion at which things are given away to free. something that is evident or obvious; something that uncovers a mystery.

it could be be in a form of a lucky draw as well. these the company events gather more audience for their pr and it also increases their ratings as well. this is a way to attract more customers towards themselves.