Which Sentence Is Expressed Correctly

Multiple Choice

Which sentence is expressed correctly?

A) Because the focus of her business had shifted, she filed for a DBA so that her business's name could more closely reflect the services she was now providing.
B) Because the focus of her business had shifted, she filed for a D.B.A.so that her business's name could more closely reflect the services she was now providing.
C) Because the focus of her business had shifted, she filed for a D.B.A. so that her business's name could more closely reflect the services she was now providing.