Step 1: Understanding the Concept:
Organizations provide different types of leaves based on the specific need of the employee, ranging from health issues to personal social obligations.
Step 2: Detailed Explanation:
Casual leave is provided for short-term absences (usually 1-3 days) to attend to personal matters, family emergencies, or social functions.
Since Varsha's leave is for a social ceremony and temporary support for a friend (non-medical for herself), and is of very short duration, it falls under the "Casual" category.
Medical leave would require a doctor's certificate for her own health, and Earned leave is typically for longer, pre-planned vacations.
Step 3: Final Answer:
The correct option is (c) Casual leave.