Lori Nichols started an engineering firm, Engineering Enterprises P$.$C$.$ During its first month of operations, the following transactions were completed:

I. Lori invested $$31,000$ in the business, which in turn issued common stock to her.

II$.$ The business purchased equipment on account for $$8,000.$

III. The business provided engineering services on account, $$12,000.$

IV$.$ The business paid salary to the receptionist, $$1,000.$

V$.$ The business received cash from a customer as payment on account $$9,000.$

$V.$ The business borrowed $$9,000$ from the bank, issuing a note payable.

At the end of the month, cash equals:

A$.$ $$31,000.$

B$.$ $$39,000.$

C$.$ $$48,000.$

D$.$ $$70,000.$