A) America is a melting pot of people of diverse ethnicity who share the common American dream.
A - Samantha returned the book herself.
When using the active voice, the subject comes before the verb with the action (Samantha returned). Passive sentences have a noun with the action being done TO them (cake was made, buildings were built, coach was pushed)
<span>C. Isolation from society can be both necessary and destructive.</span>