The largest game reserve in Nigeria is the Yankari game reserve located in Bauchi state. The Yankari game reserve covers an area of about 2,244 square kilometers and is home to a variety of wildlife species such as elephants, baboons, waterbucks, and antelopes. The reserve also has several natural warm springs and caves that are popular tourist attractions.
Therefore, is the correct answer. Options (a), (b), (d), and (e) are also game reserves in Nigeria, but they are not the largest.