Why do you want to work in [M&A / a specific group]?

Answer

Connect your interest to: (1) The kind of work — what specifically attracts you about that product or coverage area; (2) Specific deals — reference recent deals in that group that you found interesting and why; (3) Skills you'll build — what makes the group particularly valuable for your goals; (4) Exit opportunities you're considering. Show you understand what analysts actually do in that group, not just headline-level deal exposure.