Which anime character is your favorite and why? A) Killua Zoldyck
B) Bakugou Katsuki
C) Tobio Kageyama
D) Dio Brando

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.