The team worked _____ day to finish the project.

• A. Every
• B. All
• C. Most
• D. Some

Answer: (B)

This question is about expressing duration with a time noun. When you want to say someone spent the entire period of a day doing something, you use all before the time unit: all day. The sentence means the team spent the whole day working in order to finish the project. That sense of total duration fits the context of trying to complete a project in one day.

Using every would imply repeating across days—worked every day would mean across multiple days, which changes the meaning. Most and some don’t fit the idea of spending the entire duration of a single day. So the natural choice is all.