Ratchett escaped punishment for Daisy's death by leaving America. Ratchett should have been punished for Daisy's death. The people on the Calals coach had good reason to murder Ratchett.

1.) M. Bouc chooses Poirot's first solution because he does not want his company to get a bad reputation.

2.) M. Bouc chooses Poirot's first solution because he likes the people on the Calais coach.

3.) M. Bouc chooses Poirot's first solution because he believes Ratchett's murder is justified.

4.) M. Bouc chooses Poirot's second solution because he thinks murder is wrong and the murders should be punished.

5.) M. Bouc chooses Poirot's second solution because Dr. Constantine can't believe the first.