A company completed the following transactions during the month of​ October: I. Purchased office supplies on​ account, $ 5 comma 800. II. Provided services for​ cash, $ 20 comma 000. III. Provided services on​ account, $ 35 comma 000. IV. Collected cash from a customer on​ account, $ 31 comma 000. V. Paid the monthly rent of $ 3 comma 600. What was the​ company's total revenue for the​ month?

A. $ 20 comma 000
B. $ 86 comma 000
C. $ 35 comma 000
D. $ 55 comma 000