During 2009, W sold the interest she had held for five years in the WX Partnership for $15,000 cash. The buyer also assumed W's $2.000 share of the partnership liabilities. W's tax basis in the partnership was $11,000. There were no unrealized receivables or appreciated inventories involved in this transaction. What is W's gain on the sale of her partnership interest in WX?

a. $2,000 ordinary gain

b. $2,000 long-term capital gain

c. $4,000 long-term capital gain

d. $6.000 long-tern capital gain