During 2012, the accounts receivable turnover ratio for Upward Company increased from 10 to 15 times per year. Which one of the following statements is the most likely explanation for the change?

The company's credit department has followed up with customers whose account balances are past due in order to generate quicker collections.

The company has decreased sales to its most credit worthy customers.

The company has increased the amount of time customers have to pay their accounts before they are past due.

The company has extended credit to more risky customers in order to increase the accounts receivable turnover ratio.