Question

3 what is an example of formal tone? a let me explain. b this demonstrates importance. c you should see this. d this is cool.

Explanation:

A formal tone is objective, impersonal, and uses proper language. "This demonstrates importance" is more objective and impersonal compared to the others. "Let me explain" is more directive - personal, "You should see this" is somewhat casual - directive, and "This is cool" is very casual.

Answer:

B. "This demonstrates importance"