The Thomas Company now has $12,000 (his is what they paid for the inventory) of obsolete inventory stock. This inventory could be sold for $5,000 at a loss, or modified for $6,000 and sold for $15,000. The change in the company's net income resulting from modifying the inventory and then selling it opposed to selling it as is would be:

A) $3,000 decrease
B) $4,000 increase
C) $7,000 increase
D) $9,000 increase