Which of the following present and former government leaders is generally considered a dictator?
david cameron
barack obama
qaboos bin said al said
kim jong-un

D: Kim Jong-Un

Explanation:

 Kim Jong-Um is considered a dictator because he has a strog way to lead hthe citizens of North Korea, and controls the nuclear weapons and militar decisions, which many  feel it's a threat to people around the world. He also holds meetings with China leaders. Nevertheless, he allowed the presence of free market companies in his country, and received the US president.

i would say b. research typically uses a variety of sources