Which word means single?

• A. Immune
• B. Solitary
• C. Acquire
• D. Consecutive

Answer: (B)

The idea is identifying a word that conveys being one or alone. Solitary fits best because it means existing by itself, without others, or being single in number or company. You can picture a solitary figure or a solitary tree—both emphasize being alone or unaccompanied.

The other words express different ideas: immune means protected against disease or harm; acquire means to obtain or gain something; consecutive means following in order, one after another, with no gaps. So solitary is the right choice because it directly conveys the sense of single or alone.