Which word means to increase in number quickly?

• A. Placate
• B. Prudence
• C. Proliferate
• D. Propitiate

Answer: (C)

The word being tested is about rapid growth or multiplication. Proliferate means to increase quickly in number or spread widely, and you’ll often see it used for things like cells multiplying, rumors spreading, or an idea taking hold across a population. The other options don’t convey growth: placate means to calm or soothe someone, propitiate means to appease or win favor, and prudence is a noun referring to cautious good judgment. So proliferate is the best fit for “increase in number quickly.”