How does the washing of hands prevent a societal problem?

One of the fastest ways to spread a disease is through your hands. Infectious diseases could be transferred and could be caught because of it. It is important for people to wash their hands thoroughly to prevent the spread of germs and diseases. Thus, it prevents a societal problem.

It's either 3 or that ,,but if not than choose 4

Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.