Difficulty: Easy
Correct Answer: defend
Explanation:
Given data
Concept/Approach
The natural collocation is defend oneself against (an attack/attacker). While "protect oneself from" is also correct, the preposition against strongly favours "defend".
Option analysis
defend — best fit with "against": "defend himself against …." ✅safe — adjective, not a verb.secure — verb, but we usually "secure oneself against risk" in technical contexts; less idiomatic for a physical attack.protect — would typically pair with "from": "protect himself from …."
Final Answer
defend
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