Fact Pattern 30-1Shale Oil Processing Corporation Combines Its Assets and Debts

Fact Pattern 30-1Shale Oil Processing Corporation combines its assets and debts with those of Tierra Frakking Company to form United Resources, Inc. Shale and Tierra cease to exist.
-Refer to Fact Pattern 30-1.United Resources assumes 

A)  ​all of Shale's and Tierra's debts. 
B)  ​half of Shale's and Tierra's debts. 
C)  ​none of Shale's and Tierra's debts unless there is a formal transfer of liability. 
D)  ​only debts that Shale and Tierra incurred after a combination was proposed.