💡 Detailed Explanation
The correct choice is Option 2: 'Because he ended up going on a trip abroad next month.' The man clarifies that he does not use English for work ('仕事は...英語は使わないんです'). He reveals the true reason: '実は、来月アメリカにいる友人のところへ旅行に行くことになって' (Actually, next month I'm going to travel to visit a friend in America) and explains he wants to speak simple English with locals. Thus, Option 2 is correct.