Which of the Following Represents an Informal Writing Style

Which of the following represents an informal writing style?

A) James, Deloitte, and Wilts, Inc., after extensive review of references and credentials of contractors, has elected to contract with Peck Builders for the new office complex.
B) We selected Peck Builders as general contractor for our new office complex.
C) After conducting an exhaustive search of building design elements and cost-efficiency data, the company has verified the qualifications of Peck Builders.
D) The findings validate the imperative of selecting a fully qualified and bonded contractor for the new building venture of James, Deloitte, and Wilts, Inc.; that contractor is Peck Builders.