Answer:d. $30,000
Step-by-step explanation:
The reduction of loan amount from $80,000 to $50,000 means carry has gained the difference of $30,000 by paying less than the value of loan he has received.
On an overall analysis the net asset will improve from -$10,000 to $20,000 but the income from the loan reduction is $30,000 i.e,$80,000 minus $50,000.