Americans learned to value helping one another as volunteers. People of many different backgrounds valued being Americans.
People in America valued the chance to share their special culture,

c hydrophobia is the answer

what does the teacher mean

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."