The civil rights Act provides the citizens with various rights. One right is that the people should not be segregated on the basis of gender or race which is granted by the law and any inconsistency is declared as unconstitutional.
The restaurant was practicing segregation of people by separating the Blacks and the whites and making sitting arrangements accordingly.
Mr. Smith can go to the US Justice Department and file a suit against restaurant owner as the restaurant has discriminated him on the basis of color.
Therefore, based on the passage , Mr. Smith's best recourse would be "contacting the US Justice Department about filing a potential discrimination lawsuit" OPTION B is correct.
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