The Following Transactions Occurred During July

The following transactions occurred during July:
1) Received $900 cash for services provided to a customer during July.
2) Received $2,200 cash investment from Bob Johnson, the stockholder of the business.
3) Received $750 from a customer in partial payment of his account receivable which arose from sales in June.
4) Provided services to a customer on credit, $375.
5) Borrowed $6,000 from the bank by signing a promissory note.
6) 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.