The option that best explains the prevalence of banana plantations in Central America is Option C: "Banana plants were brought to Central America from Southeast Asia to be grown closer to markets in the United States and Canada."
While bananas were first domesticated in Southeast Asia, they became a major agricultural product in Central America after being introduced there. The favorable climate and conditions in Central America made it ideal for large-scale banana cultivation, which was primarily aimed at export to markets in the United States and other countries. This option accurately reflects both the geographical origin of the banana plants and their role in international trade.