Final answer:
Manolin's character is revealed as attentive and caring towards Santiago, proving himself loyal and compassionate by continuing to help with fishing preparations.
Step-by-step explanation:
The character of Manolin is disclosed as being attentive and caring towards Santiago. This is shown through option (d), which states he is attentive to Santiago, giving him encouragement and helping with the preparations even though he can no longer fish with him. This reveals that Manolin values his relationship with Santiago and respects him, despite not being able to accompany him on the fishing trips anymore. Manolin's character is one of loyalty and compassion, which are significant traits that contribute to his actions in the narrative.