The Following Transactions Occurred During July

The following transactions occurred during July:
Received $900 cash for services provided to a customer during July.
Received $2,200 cash investment from Bob Johnson,the owner of the business.
Received $750 from a customer in partial payment of his account receivable which arose from sales in June.
Provided services to a customer on credit,$375.
Borrowed $6,000 from the bank by signing a promissory note.
Received $1,250 cash from a customer for services to be rendered next year.
What was the amount of revenue for July?

A) $ 900.
B) $ 1,275.
C) $ 2,525.
D) $ 3,275.
E) $ 11,100.