The Captain said to his men, "Stand at ease."

Original Sentence (Direct Speech):
The Captain said to his men, "Stand at ease."

Step-by-step Conversion:
1. The sentence is an imperative sentence, which means it gives a command or instruction.
2. In indirect speech, imperative sentences are converted using verbs like ordered, requested, advised, commanded, urged depending on the tone.
3. Since the speaker is a Captain addressing his men, it clearly shows authority. So, the correct reporting verb is “commanded”.
4. The base verb “stand” is changed to the infinitive form: “to stand at ease”.

Correct Sentence:
The Captain commanded his men to stand at ease.

Correct Answer: Option D

Why other options are incorrect:
Option A: “urged” — ❌ not suitable for a military command, as "urged" implies a suggestion, not a command.
Option B: “wanted” — ❌ incorrect reporting verb for a direct order.
Option C: “told… they should…” — ❌ indirect and not appropriate for the strong tone of a command.

Final Answer: Option D – The Captain commanded his men to stand at ease.