Option B is the correct answer.
Explanation:
When holding company sold the asset to subsidairy company at a gain of $100000,but that gain used to get eliminated for consolidation purposes and was depreciated every year as excess cost was taken over by subsidiary. So after two year gain on [tex]\$ 60000(100000-(20000 * 2))[/tex]. Will be added to consolidated statement as now asset has been sold externally by subsidiary to another, so gain of $60000 will also be recognized.
Therefore, the correct answer is (B). Increase gain on sale by $60000 .