Which detail best supports the idea that Ellis Island was often frightening to the immigrants?
Immigrants who failed exams were sent home.
Ellis Island began processing immigrants in 1892.
People were asked questions at Ellis Island.
It was the country's main processing center.

Betray, destroy, and obey do not need to be changed to add the suffix -ed, because the "y" at the end of each word is preceded by a vowel  (so  they would be spelled  "betrayed," "destroyed," and "obeyed").

but hurry is different; it has to  be spelled "hurried" because the "y" at the end of "hurry" is preceded by a consonant.

Holding up a hand because you are not speaking but you are still trying to indicate something tough you do not use words to express it.