Langdon Company experienced an accounting event that affected its financial statements as indicated below:

Which of the following transactions could have caused the indicated effects on the company's accounting equation?

a. Goods transferred from work in process to finished goods. b. Allocation of underapplied overhead to cost of goods sold. c. Collection of account receivable. d. Allocation of overapplied overhead to cost of goods sold.

Assets Liab. Equity Rev. Exp. Net Inc. 250 (250) (250) n/a