Houston Company's current ratio is 3 to 2. The company is negotiating a loan, and the company's management understands that a higher (i.e., better) current ratio will reduce the company's cost of borrowing (interest rate). Which of the following transactions will improve Houston Company's current ratio? Select one:

a. making a payment on a long-term debt

b. using cash to pay current liabilities

c. purchasing inventory on account

d. collecting on some of the company's accounts receivable

e. none of the above