 What best describes the overall structure of Captain Hannah's dialogue when recounting his time caring for the marocca plants?
Captain Hannah climbed painfully down from the Delta Crucis , hobbled across the spaceport to where Beulah and I were waiting to greet him and hit me in the eye. "When I left, marocca was growing like mad," said Captain Hannah. "You'll remember that I warned you that we should take some marocca out into space and solve any problems we might find before committing ourselves to hauling a full load of it?" asked Captain Hannah. It gradually brightened until 'noon time', with the ports pointing straight at the light source, and then dimmed until we had ten and one-half hours of darkness.
 A problem-solution structure.
 An argument and supporting details along with counterclaims structure.  A catchphrase followed by explanations structure.  A purpose and explanation structure.  A problem-solution structure.