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: (CNN) The United Nations did not do enough to prevent the spread of cholera epidemic in Haiti that killed at least 10,000 people after the 2010 earthquake, Secretary-General Ban Ki-moon said Thursday in his first formal apology for the outbreak. To many, the apology was long overdue. The UN denied claims that Nepalese peacekeepers brought cholera to the island nine months after the devastating earthquake, the first known appearance of the disease there in over 150 years. Scientists, victims' families and advocacy groups accused peacekeepers of spreading cholera through improper sanitation disposal at their base near a river. With a month left in his term, Ban issued the carefully worded apology as part of an announcement of a new plan to eradicate the disease.Advocacy groups blame UN peacekeepers in Haiti for bringing cholera to islandUN has long denied it is responsibleMoon calls epidemic a "blemish" on UN peacekeepers' reputation 
 Question:"The people of Haiti have long deserved more than just acknowledgment for the pain and sacrifice they have suffered in great part due to _ negligence.

United Nations