Answer:
The correct answer is (C), adding or subtracting a suffix often changes a word`s part of speech.
Step-by-step explanation:
A suffix is a letter or group of letters added at the end of a word that makes a new word. Most often the word is a new word class from the original.
For example, in the word forget, if you add -ful it becomes forgetful. In the word. Other examples may be beauty+ful= beautiful; able+ity= ability.
The suffix can change a verb to adjectives, -ment (contentment) or verbs to nouns, -ion (population).
Also, suffixes change the spelling of the original word.
I hope it helps!