How long do the children of merchants go to school?

The correct choice indicates that children of merchants attend school from the age of 20 moons until they are 7 years old. This is consistent with the depiction of the educational system in Lilliput, where children are expected to begin their formal education at a certain age, reflecting a society that values education and has defined stages of learning.

In the narrative, it emphasizes that children in merchant families receive schooling that prepares them for their roles in society, demonstrating a structured approach to education. The specific ages also suggest a longer initial period of education before they enter the workforce, which aligns with the cultural norms presented in Jonathan Swift's satire.

The choice also portrays a system where education is seen as essential for future success, particularly in commerce and trade, reflecting the economic and social dynamics of Lilliputian society.