The following information ($ in millions) comes from a recent annual report of Amazon.com, Inc.:

Net sales	$	10,903
Total assets	$	4,545
End of year balance in cash	$	1,104
Total stockholders' equity	$	420
Gross profit (Sales Cost of Sales)	$	2,481
Net increase in cash for the year	$	21
Operating expenses	$	2,054
Net operating cash flow	$	642
Other income (expense), net	$	(14)

Compute Amazon's total liabilities at the end of the year.

A. $2,166

B. $4,535

C. $4,125

D. $4,545