Which of the following best describes what alveoli are a b c d

Ibelieve the answers are a and c.

The answer is b. increased blood flow reduces nerve sensitivity

I’m going to guess these are the choices: a) recreational skiing developed in the mid-19th century b) it was originally invented as a way of getting from place to place in snowy regions c) downhill skiing is currently the only common form of the sport d) it mostly evolved from snowshoeing- if that’s the cases then the answer would be c) downhill skiing is currently the only common form of the sport