Which of the Following Statements Uses the Most Formal Language

Which of the following statements uses the most formal language?

A) Hello, I'll make sure I send you the required details at the earliest.
B) Hey, the project is moving ahead as expected and should be completed much ahead of the estimated date.
C) Greetings, in order to comply to the request I'll need the previous financial records ASAP.
D) Hi, did you get the chance to double check those records I sent you?
E) Hello, we will ensure that all the pending requests are resolved by the end of the day.