Based on Michael's preferences for hands-on work, troubleshooting, problem-solving, and completing a technical program in a short period of time, the best option for him would be:
D. automotive master mechanic
This career involves hands-on work with vehicles, requires problem-solving skills to diagnose and fix issues, and typically allows for training through technical programs or vocational schools that can be completed in a relatively short timeframe. The other options listed are more administrative or less hands-on in nature.