The following are the January 1 and June 30 balance sheets of a company:

                                                 Assets (in millions)

                                               January 1    June 30

Cash                                                $3        $4

Accounts receivable                                  5          4

Inventories                                           8         10

Fixed assets                                        10         11

Total assets                                        $26       $29

Accounts payable                                   $2         $3

Notes payable                                       4          3

Accrued wages                                      1          2

Long-term debt                                     9          11

Stockholder's equity                               10          10

Total liabilities and stockholders' equity           $26        $29

From January 1 to June 30, the net working capital

A. Increased by $2 million.

B. Increased by $1 million.

C. Stayed the same.

D. Decreased by $1 million.