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Read the passage: The 'butterfly effect' is a concept from chaos theory which suggests that small changes in initial conditions can lead to vast differences in later outcomes. A butterfly flapping its wings in Brazil might, in theory, cause a tornado in Texas. Question: What is the main point of the 'butterfly effect'?

AButterflies are very strong

BSmall causes can have large, unpredictable effects

CWeather is easy to predict

DBrazil and Texas have similar weather