Final answer:
Tabaqui is referring to an unspecified person's gratitude and may want to use it for their own advantage. The main theme of the passage is manipulation and hidden motives.
Step-by-step explanation:
a) Tabaqui is referring to the gratitude of an unspecified person. It is not mentioned in the passage whose gratitude Tabaqui is talking about, but we can infer that it is directed towards someone who would benefit from knowing about it.
b) Tabaqui might want to tell someone about the gratitude as a way to gain favor or leverage. By sharing this information, Tabaqui may be able to manipulate the situation or use it for their own advantage.
c) The implication of this question is that Tabaqui may have ulterior motives for revealing the gratitude. This raises suspicion about Tabaqui's intentions and highlights the complexity of the situation.
d) The main theme of this passage is manipulation and hidden motives. The question posed by Tabaqui suggests that there is more to the situation than meets the eye, emphasizing the theme of deceit and manipulation.