Upon the arrival of the inspecting officer, what does the platoon commander say?

The correct response when the inspecting officer arrives is "First platoon is standing by for your inspection, Sir." This phrasing demonstrates the appropriate level of respect and formality in military settings. The term "standing by" indicates readiness and attentiveness, suggesting that the platoon is prepared and waiting for the officer's assessment. This choice captures the proper military etiquette by acknowledging the presence of the inspecting officer while also conveying a state of readiness.

In the context of the other options, "First platoon is ready for inspection, Sir" lacks the nuance of readiness implied by "standing by." The response "Drill Team is prepared for inspection, Sir" is less appropriate since only the assigned platoon should be addressed. Finally, saying "First company is awaiting inspection, Sir" misrepresents the size of the unit being referred to, as the question specifically concerns a platoon, not a company.