Question

We .................. keep our promises.

• A. ought
• B. need
• C. must
• D. could

Hint:

Use "must" to express strong necessity or moral obligation.

Answer 1

The Correct Option is C

Step 1: Identify the context.
The sentence expresses a strong obligation.

Step 2: Rule of modal usage.
"Must" is used for strong necessity or moral duty, which fits "keep our promises."

Step 3: Eliminate options.
(A) Ought – also possible but weaker, less forceful than "must."
(B) Need – implies requirement but not as strong.
(D) Could – expresses ability, not obligation.