Since you aren't saying "the officer", it is specifically referring to one officer. Capitalize, officer.
Answer:
"The daylight is coming," Dave said. "We should go now."
Explanation:
In the second option, the phrase "The daylight is coming" is lacking quotation marks. The third option is chaotic because it has no punctuation whatsoever. Finally, the fourth option is nearly perfect, but the comma after said should be a period because "We should go now" is independent from "The daylight is coming."
What is the poem for this?
