A. Agreeable
B. Required
C. Useful
D. Stubborn

Explanation:

The word obligatory means required by law, rule, or duty; compulsory.

In simple words: something that must be done.

So, the synonym of obligatory is required.

Real-Life Example

• Wearing a helmet is obligatory while riding a motorcycle.
• Wearing a helmet is required while riding a motorcycle.

Compulsory = Obligatory

Main Points for Exams

• Obligatory means compulsory, mandatory, or required.
• Required is its correct synonym.
• Other options are unrelated meanings.
• Therefore, Option B is correct.
• Common in PPSC, FPSC, CSS, PMS, NTS, IELTS, TOEFL exams.

Quick Memory Trick

📋 Obligatory = Must Do
✅ Required = Same Meaning

Optional ↔ Obligatory
Obligatory ↔ Required ✔️