A. Light
B. Difficult
C. Burdensome
D. Fluent

Explanation:

The word onerous means something very difficult, heavy, or full of burden or responsibility.

In simple words: a task that is hard and tiring to do.

The opposite of onerous is light, which means easy, simple, or not heavy (not a burden).

So, Light is the correct antonym of Onerous.

Real-Life Example

Imagine two homework tasks:

• A long project with many pages and difficult questions → this is onerous.
• A short worksheet with easy questions → this is light.

Hard and tiring work = Onerous
Easy and simple work = Light

Main Points for Exams

• Onerous means difficult, heavy, or burdensome task.
• It is often used for work, duties, or responsibilities.
• Light means easy and not difficult.
• Difficult and Burdensome are synonyms of onerous.
• Therefore, Light is the correct antonym of Onerous.
• This type of question is common in PPSC, FPSC, CSS, PMS, NTS, IELTS, TOEFL, and other competitive exams.

Quick Memory Trick

❌ Onerous = Heavy Work
✨ Light = Easy Work

Heavy ↔ Easy
Onerous ↔ Light ✔️