From a Consolidated Entity Point of View, the Constructive Gain

From a consolidated entity point of view, the constructive gain or loss on the open market purchase of a parent company's bonds by a subsidiary company is:

A) considered realized at the date of the open market purchase.
B) realized in future periods through discount and premium amortization on the books of the individual companies.
C) realized only to the extent of the parent company's interest in the subsidiary.
D) deferred and recognized in the consolidated income statement when the bonds are retired.