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: Abuja, Nigeria (CNN) Giggling and chatting among themselves, it's hard to imagine that just one week ago, these girls were at the mercy of one of the world's deadliest terrorist organizations. As the Chibok girls waited patiently Wednesday to meet the man who signed off on their release -- Nigerian President Muhammadu Buhari -- it was remarkable to see the physical transformation from emaciated and haggard looking former hostages to seemingly carefree and happy young women. The faded and torn clothes they arrived in have since been replaced with tailored and brightly colored fabrics that concealed their still painfully-thin frames.More than 270 girls were abducted from a school in Chibok in 201421 freed last week face adjustment to society, overcoming pain of ordeal 
 Question:Boko Haram kidnapped 276 girls and women, ages 16 to 18, in the middle of the night at a boarding school in Chibok, _, in April 2014, drawing global outrage.

Nigeria