Idiom “Burn the midnight oil” means:

A. Finish all resources
B. Heat up a place to make it comfortable
C. None of these
D. Stay awake or study late into the night 

🧠 Explanation:

The idiom “burn the midnight oil” means staying awake or studying late into the night. For language or literature students, understanding idioms enriches communication, making it a key topic for studying English expressions, cultural phrases, and effective language use in writing or speaking.