D.
It’s the first thing they say.
After reading the summary of "In the Rockpilei" it has become clear that the word which accurately describes Roy is definitely 'disobedient'. I choose this one because he didn't behave and just stole away, leaving all the responsibility on his brother. Hope you will agree with me, regards!
it is helpful in locomotion
Separate from each other and stay away from each other until the boat come back