Final answer:
The misconception that this passage refutes is that more Mexicans are moving to the US than Americans are moving to Mexico.
Step-by-step explanation:
The passage refutes the misconception that more Mexicans are moving to the US than Americans are moving to Mexico. The passage states that more Americans have been added to the population of Mexico over the past few years than Mexicans have been added to the population of the United States. This means that the number of Americans moving to Mexico has exceeded the number of Mexicans moving to the US. Therefore, option b. is the misconception that this passage refutes.