Mumtaz, Badia and Ilya Are Partners in a Business Partnership

Mumtaz, Badia and Ilya are partners in a business partnership, called MBI. Mumtaz contributes $15,000 to the business, Badia contributes $10,000 and Ilya contributes $5,000. The partners agree among themselves that they will share partnership profits and losses in proportion to their contributions. In addition, the partnership borrows $30,000 from the bank. The business doesn't work out, MBI is unable to repay the loan. The bank sues Mumtaz personally. The amount the bank can legally recover from Mumtaz is:

A) nothing
B) $5,000
C) $10,000
D) $15,000
E) $30,000