💡 Detailed Explanation
'Kushi' (駆使) means to make full use of something, like a skill, tool, or knowledge, often implying mastery. Choice 1 is correct as it describes skillfully using language abilities to their full potential. It is typically used for skills, technology, knowledge, or languages. The other choices would be better expressed with simpler verbs like 'riyō suru' (to use) for 2, '(buka o) tsukau' (to use subordinates) for 3, and 'nomu' (to drink) for 4.