Which of the Following Is True About Trade Name

Which of the following is true about trade name?

A) There can be only one business using the same name within a state.
B) Assumed name is completely different from trade name.
C) Most states allow several firms to use the same trade name,as long as the firms are in different lines of business.
D) Most states allow several firms to use the same trade name even if they are in the same town and have received a service mark.