The courage shown by the soldiers at this moment of crisis is exemplary.

The correct answer is D. admirable.

The word “exemplary” means “serving as a model or example.” In this case, the soldiers are being praised for their courage, which is a quality that is admired by many people. The other options are not as appropriate in this context.

• The word “suitable” means “appropriate or fitting.” While the soldiers’ courage may be appropriate for the situation, it is not the most important quality to focus on.
• The word “clear” means “easy to understand.” The soldiers’ courage is not necessarily easy to understand, but that is not the point.
• The word “elementary” means “basic or simple.” The soldiers’ courage is not basic or simple, but it is a quality that is admired by many people.

Therefore, the correct answer is D. admirable.