I would like to update you ______ the main points discussed at the meeting this morning.

• A. At
• B. For
• C. About
• D. On

Answer: (B)

Choosing the right preposition after update is about signaling that you’re giving someone information about a topic. In this sentence, you’re briefing someone on what was discussed, so the natural choice is update you on the main points. The preposition on is the standard collocation here, meaning you’re providing the latest details about that topic. Using about is also possible in some contexts, but on is the most common in formal or business communications. At and for don’t fit the sense of informing someone about the topic of discussion. So the sentence reads: I would like to update you on the main points discussed at the meeting this morning.