Is there any plural verb that ends in "s"​

Complete the following sentence with the phrase that is grammatically correct public libraries are important because they encourage learning, provide low-cost resources, and o o a. inspire community involvement b. community involvemeling o c. to inspire community involvement o d. inspiring community involvement

What happens to lovers when there are decreased levels of serotonin in the brain?

Evaluate the tone of this cover letter. is it appropriate?