Which word means used to supplement something or someone?

• A. Subsidiary
• B. Subsidy
• C. Sum
• D. Succinct

Answer: (A)

Subsidiary is the word that describes something that serves to supplement or support something else, indicating a secondary or auxiliary role rather than the main element. In everyday use, you can talk about subsidiary details or subsidiary benefits—extras that add to the primary thing. In business, a subsidiary is a company controlled by a parent, which reinforces the sense of being secondary or supporting. The other options don’t fit this meaning: subsidy refers to financial aid, sum is the total amount, and succinct means brief or concise. So subsidiary is the best fit.