Rodriguez Company reported sales revenue of $100,000 and total expenses of $90,000 (including depreciation) for the year ended December 31. During the year, accounts receivable decreased by $4,000, merchandise inventory increased by $3,000, accounts payable increased by $2,000, and depreciation expense of $7,000 was recorded.

Assuming no other data are needed, the net cash inflow from operating activities for the year was:

A. $18,000

B. $13,000

C. $20,000

D. $ 7,000