Answer:
C. extrinsic motivation
Explanation:
Extrinsic motivation can be useful for persuading someone to do something. Before offering a reward-based task, it's important to know if the person doing the task is motivated by the reward being offered. For example, extrinsic motivators can be useful to help children learn new skills. (When used in moderation.)
Factories, smoking, cars, littering
Explanation:
our chemical barriers protect almost every infection we can get in our body
