Which suffix forms the adjective 'agreeable' from 'agree'?

• A. -age
• B. -al
• C. -ance or -ence
• D. -able or -ible

Answer: (D)

Adding the suffix -able to a verb to form an adjective is a common way to express “able to be” or “capable of being X.” With agree, attaching -able gives agreeable, meaning pleasing or acceptable—something that can be agreed with or that inspires agreement.

The other suffixes don’t produce a standard adjective from this root: -age tends to form nouns (like storage or courage), -al would produce an uncommon or incorrect form, and -ance/-ence also form nouns (like agreement). So the best fit for turning agree into a usable adjective is -able (with -ible as a related variant used in different roots).