Which statement would you identify as being correct? it is important to learn the etymology of every word in a text. it is important to understand the etymology of every word in a text. it is important to study the etymology of every word in a text. it is important to study the etymology of some words in a text.

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.