The balance in accounts receivable at the beginning of the year was 550,000. the balance in accounts receivable at the end of the year was 780,000. customer accounts of 480,000 were written off. The company collected 4,060,000 from credit customers and 1,040,000 from cash customers. What are credit sales for the year?

A. 4,540,000

B. 4,770,000

C. 4,310,000

D, 4,060,000