Which statement below is true?

Bob received this text message on his mobile phone: “Hello, this is Scott Smelby from the Yahoo Bank. Kindly contact me for a vital transaction on: [email protected]” .

Which statement below is true?
A . This is a scam as everybody can get a @yahoo address, not the Yahoo customer service employees.
B . This is a scam because Bob does not know Scott.
C . Bob should write to [email protected] to verify the identity of Scott.
D . This is probably a legitimate message as it comes from a respectable organization.

Answer: A