I will check ______ with you by the end of the week.

• A. In
• B. On
• C. With
• D. By

Answer: (A)

The main idea being tested is how the phrasal verb check in is used to mean contacting someone to touch base or share updates. Using in with the person you’re speaking to forms the common expression check in with you, which conveys the plan to reach out and provide or confirm information by a specified time. So the sentence reads as I will check in with you by the end of the week, meaning you’ll hear from me to connect and update you by that deadline. Other prepositions shift the sense: check in on you sounds like seeing how you’re doing; check on you is similar but focuses more on monitoring your status; check with you would mean seeking input, which is a different nuance and less natural for stating you’ll initiate contact by a deadline.