Which of the following words is closest in meaning to “Proximity”?

Proximity means nearness in space or time.

• Correct answer - nearness: it has the same meaning as Proximity.
• usefulness: the quality of being useful - wrong, it does not mean the same as Proximity.
• interest: curiosity or concern about something - wrong, it does not mean the same as Proximity.
• similarity: likeness - wrong, it does not mean the same as Proximity.