Correct Answer: C. Stay
Detail about MCQs
In the given sentence, “calm” refers to a state of tranquility, where one is not agitated or upset. “Remaining calm” means to stay composed and not become anxious or agitated in a particular situation. So C. Stay: “Stay” is the correct synonym for “calm” in this context. “Remaining calm” and “staying calm” both convey the idea of maintaining composure and not becoming agitated.