Could someone please help me with this question? And Possibly explain why this is the answer?

In an effort to concentrate its resources in more protable areas, Train Corporation recently sold its family cookbook segment but retained its restaurant segment The disposal constitutes O a) none of these 0 b) an item which does not require disclosure 0 c) a discontinued operation, which should not be disclosed net-oftax effects 0 cl) a discontinued operation, which should be treated as a prior period adjustment 0 e) an extraordinary item