In year 2, Mary contributed $1,000 to the partnership; her share of partnership income was $5,000 of taxable income and her share of the Section 179 expense was $3,000. Mary's partnership liabilities decreased by $2,000. The balance in Mary's capital account at year-end should be: _________

a. $21,500
b. $18,500
c. $22,500
d. $19,500