The correct responses for why colonial minutemen were so prepared for the arrival of the British in Concord include:
- Paul Revere had warned villages that the redcoats were coming.
- When the British headed out, Americans hung two lamps as a warning signal.
These two actions were crucial in alerting the colonial militias about the British troops' movement, allowing them to prepare for the confrontation. The other options listed don't accurately relate to the preparation of the minutemen in this specific context.