Not for sure got to different answer between (a) and (b) need help figure out which answer is correct.Any help greatly appreciated.

Question 20 Amazon's cash-based net income for the most recent reporting period was (in millions): o a. $3,033 e b. $18,434 O c. $4,106. d. $177,866. CONSOLIDATED STATEMENTS OF CASH FLOWS (in millions) Year Ended December 31 2015 2017 CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD OPERATING ACTIVITIES Net income Adjustments to reconcile net income to net cash from operating activities: S 14,557 S 15,890 S19,334 596 3,033 of property and equipment, including internal-use software and capitalized content costs 8,116 2,975 Stock-based compensation Other operating expense, net Other expense (income), net Deferred income taxes 11,478 4,215 202 (292) (29) 2,119 250 (20) (246) Changes in operating assets and liabilities: Accounts receivable, net and other Accounts payable Accrued expenses and other Unearned revenue (1,426) (3,367) 5,030 1,724 (3,583) (4,786) 7,175 283 738 18,434 (1,755) 1,292 Net cash provided by (used in) operating activities 2,03917 INVESTING ACTIVITIES: Purchases of property and equipment, including internal-use software and website Proceeds from property and equipment incentives Acquisitions, net of cash acquired, and other Sales and maturities of marketable securities Purchases of marketable securities (5,387) (011,955) 1,897 (13,972) 9,988 (13,777) (27,819) 1,067 (795) 3,025 (4,091) (6,450) 4,733 (7,756) (9,876) Net cash provided by (used in) investing activities FINANCING ACTIVITIES Proceeds from long-term debt and other Repayments of long-term debt and other Principal repayments of capital lease obligations Principal repayments of finance lease obligations 16,231 (1,372) 4,799) (1,652) (2,462) (121) (3,882) (374) 1,333 (354) (3,860) (147) (3,740) (212) 3,444 19,334S Net cash provided by (used in) financing activities 9,860 Foreign currency effect on cash and cash equivalents Net increase (decrease) in cash and cash equivalents CASH AND CASH EQUIVALENTS, END OF PERIOD SUPPLEMENTAL CASH FLOW INFORMATION: Cash paid for interest on long-term debt Cash paid for interest on capital and finance lease obligations Cash paid for income taxes, net of refunds Property and equipment acquired under capital leases Property and equipment acquired under build-to-suit leases 1,188 20.522 15,890 S 325 S 290 S 206 328 4,717 5,704 1,209 9,637 3541