At the end of the month, the Supplies (asset) account of Tony's Toy Shop reflects a balance of $2,000. When she counts her office supplies, she finds that only $600 worth is still left. What end-of-period adjustment should Betty make? Select one: a. None of the other options b. Decrease Office Supplies (asset) by $1,400 and decrease Office Supplies Expense by $1,400. c. Decrease Office Supplies (asset) by $1,400 and increase Office Supplies Expense by $1,400. d. Decrease Office Supplies (asset) by $600 and increase Office Supplies Expense by $600.