Fill in the blank with the correct option.
Despite the chaos during the emergency, the nurse remained ........... and performed her duties with great precision.
To solve the problem of filling in the blank with the correct option, we should analyze the context provided by the sentence. The sentence describes a nurse who, despite the chaotic environment during an emergency, is able to perform her duties with great precision. The context suggests that the attribute needed in this sentence is one that denotes calmness, stability, and composure. Let's evaluate the provided options:
Considering the above analysis, the best choice to fill in the blank is "placid" as it accurately reflects someone remaining calm and composed amid chaos.