Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Paso Canoas, Costa Rica (CNN) Yolanda ticks off the countries she and her husband have passed through in the last three months: Brazil, Peru, Ecuador, Colombia, Panama and now Costa Rica. But she is no tourist. "A lot of roads, lots of bus rides, and a lot of walking too," she tells CNN, agreeing to be interviewed but asking that we only use her first name and not show her face. "For a 7-month pregnant woman, that is a long, long time." Yolanda says she is originally from Congo. She and her husband are among tens of thousands of migrants -- many from Africa and Haiti -- criss-crossing South and Central America trying to reach the United States.A huge surge in undocumented migrant arrivals in Costa RicaMigrants are traveling through Latin America to the United StatesThey are vulnerable to crime, hunger and human trafficking 
 Question:"No one was prepared or was thinking about the possibility that we would receive 10,000 people from _ or Africa."

Haiti