Question

what does killed two birds with one stone mean?
agreed to something at the same time
in two places at once
served two purposes at once
in the same place at the same time

Explanation:

"Killed two birds with one stone" is an idiom. It means achieving two things with a single action. Among the options, "served two purposes at once" best captures this meaning. The other options do not accurately convey the essence of the idiom. "Agreed to something at the same time" is about agreement, not achieving two things. "In two places at once" is about physical location. "In the same place at the same time" is also about location.

Answer:

served two purposes at once