What did he insist on doing during the meetings?

The choice indicating that "he insisted on speaking only English" captures a specific condition he set during the meetings, highlighting a commitment to language use that may facilitate clearer communication or maintain professionalism. This insistence suggests that he valued a particular standard or format for dialogue, likely to ensure that everyone involved could participate effectively or that there was no ambiguity in the conversations taking place.

In the context of group discussions where multiple languages might be present, insisting on the use of one language can be crucial for clarity and understanding among participants. Thus, this answer aligns closely with a common scenario in international or diverse group meetings, emphasizing the importance of language as a tool for effective communication.

The other choices present different actions related to meeting dynamics, but they do not focus on the critical aspect of language usage, which is why they do not accurately reflect his insistence as described in the question.