At night / On the weekend

A could be literally correct, but when someone asks "When do you usually do something," the expected resonse isn't the time of day (I go to the movies at 7 p.m.) but on what types of occasions. In this case, "on the weekend."

As was recently discussed here, it doesn't seem fair to provide to more tha one grammatically okay answer and ask which is correct. However, if it asked "which is best" then C gives the expected answer.

What about "during the weekend"? Is it acceptable? Is there a difference between using "on" and "during" if the phrase is correct?  Thanks in advance.

LRR: Thanks for that! I had no idea that "on the weekend" would be wrong in British English!

YL: During the weekend makes it sound like to goes on for a long period. Going out to eat may take a long time, but not take the entire weekend. It's not a requirement that something last the entire weekend to use "during," but it does carry an implication of a longer activity or status than dinner.

N2G: Yes, that's fine. There's no real difference.

Grammar Geek wrote:

LRR: Thanks for that! I had no idea that "on the weekend" would be wrong in British English!

I was surprised to find the following when I looked up 'weekend' in the Oxford Advanced Learner's Dictionary.

on the weekend (BrE)

on the weekend (BrE, informal)

at the weekend (especially NAmE)

Are you doing anything over the weekend?