Foxboro Company experienced an accounting event that affected it balance sheet and income statement in the following way:

Assets: -/+

Liabilities: NA

Equity: NA

Revenue: NA

Expenses: NA

Net Income: NA

Which of the following accounting events could have caused these effects on Foxboro's statements:

a. Purchase raw materials inventory on account

b. Transfer cost from work in process to finished good inventory

c. Recognize revenue from merchandise sold for cash

d. None of the above