challenge: What was the reason behind Al-Shabaab's attack on Kampala, Uganda on 11 July 2010?
  
  A. As part of a broader campaign to capture key cities in East Africa
  B. In retaliation for Uganda's support of the Transitional Federal Government
  C. In response to Uganda's military invasion of Somalia
  D. To disrupt the African Union's humanitarian aid efforts
  Answer: 