The correct answer is B.

Lehman Brothers, like many other financial institutions, relied heavily on the repo market for funding. A repo, or repurchase agreement, is a form of short-term borrowing for dealers in government securities. In a typical repo transaction, a dealer sells government securities to investors, usually on an overnight basis, and buys them back the following day at a slightly higher price. The difference in price is the dealer's overnight interest cost. Lehman Brothers was heavily reliant on these short-term funding sources, borrowing billions of dollars each day in the overnight wholesale funding markets to operate. This reliance on short-term funding was a significant factor in Lehman's collapse when the liquidity of these markets dried up during the financial crisis.

Choice A is incorrect. While Lehman Brothers did use the bond market as a source of funding, it was not their primary source during the period leading up to the financial crisis. The bond market can be a more expensive and less flexible form of financing compared to other sources.

Choice C is incorrect. Stock sales were not the primary source of funding for Lehman Brothers during this period. Selling stock is a way to raise equity capital, but it also dilutes existing shareholders' ownership in the company, which can be undesirable from a management perspective.

Choice D is incorrect. Reserves are typically used as a buffer against unexpected losses and are not generally considered as a primary source of funding for ongoing operations in financial institutions like Lehman Brothers.

Things to Remember

• Repo market is a key component of the short-term funding market where financial institutions can obtain funding by selling securities with an agreement to repurchase them at a later date.
• Lehman Brothers' heavy reliance on short-term funding sources like the repo market made them vulnerable to liquidity risks during the financial crisis.
• Bond market is a source of long-term funding through the issuance of bonds, which can have higher costs and less flexibility compared to short-term funding sources.
• Stock sales can be used to raise equity capital but may dilute existing shareholders' ownership and control in the company.
• Reserves are typically held by financial institutions as a cushion against unexpected losses and are not meant to be a primary source of funding for ongoing operations.