Which of these is an example of a plateau period?

a. you recently received a good review from your boss, but you're tired of your current position.
b. you're excited about starting a new job, but also a bit nervous.
c. you take up a sport you've always been interested in and learn how to play it quickly.
d. a community group invites you to become a member.

B. You're excited about starting a new job, but also a bit nervous.

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases.