Select the option that is closest in meaning to the word “defend”.

The correct option is Safeguard.

Explanation:
The word "defend" means to protect someone or something from harm, danger, attack, or damage.
Similarly, "safeguard" means to protect, shield, or guard something to keep it safe from harm, making it the closest in meaning (synonym) to "defend".

Analysis of Options:
• Endanger: Means to put someone or something in danger or at risk of harm, which is an antonym of defend.
• Abandon: Means to leave behind, desert, or cease supporting or looking after someone or something.
• Safeguard: Means to protect or shield, which aligns directly with the definition of defend.
• Reveal: Means to make known or uncover something that was previously hidden or secret.