Which of the following metals is kept in kerosene oil to prevent its burning in air?

Sodium is a highly reactive alkali metal that reacts vigorously with air and moisture. To prevent this reaction, sodium is stored under kerosene oil, which creates an inert barrier preventing contact with air. While lithium (option C) is also stored under oil, sodium is the most common example taught in chemistry. Uranium and radium are radioactive metals with different storage requirements.