Suffix -ism means?

• A. Process
• B. Disease
• C. Idea
• D. Condition, state of

Answer: (C)

The suffix -ism turns a root into a noun that names a belief, doctrine, or system of thought. It signals an idea or principle that someone follows or a theory around which a movement or philosophy is built. That’s why it aligns with “Idea” best—as in realism, capitalism, or Islam, each word points to a belief or ideology. It isn’t typically used to denote a process or a disease, which is why those options don’t fit as well.