By The Great Horn Spoon Ch 1-7

Jack wants to go to the gold fields and strike it rich in order to save Aunt Arabella's home and help his family. This suggests that Jack is motivated by a sense of responsibility and love for his family. He sees the opportunity to find gold as a way to improve their financial situation and prevent them from losing their home. This explanation aligns with the idea that Jack is driven by a desire to support and protect his loved ones, rather than personal ambition or a desire for adventure.

The Captain orders Praiseworthy to shovel coal into the coal bunkers.

Praiseworthy puts coal dust on Good Luck, the pig, in order to uncover the "cut-purse". This suggests that by applying coal dust, any stolen items or evidence of theft would become visible on the pig's body, helping to identify the thief.

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Jack worries about Sunday dinners because he is afraid that they are going to eat Good Luck the pig.

The ship first arrived in Rio de Janeiro, Brazil. This can be inferred from the information provided in the question, where the options mention different countries and cities. Among the given options, Rio de Janeiro, Brazil is the only city in Brazil, indicating that it is the correct answer.

Tierra del Fuego is called "land of fire" because the natives of the region keep fires going to protect themselves and their sheep from freezing. This practice has been a traditional method of survival in the harsh and cold climate of Tierra del Fuego.

Jack and Praiseworthy bought bananas, pineapples, and guava in Rio de Janeiro that they never saw in Boston. This suggests that these fruits are not commonly found or easily accessible in Boston, but are more readily available in Rio de Janeiro.