No senator spoke at the convention unless he or she was aDemocrat. NoDemocrat both spoke at the convention and was a senator.
Which one of the following conclusions can be correctly drawn from the statements above
A．No one but senators spoke at the convention.
B．NoDemocrat spoke at the convention.
C．OnlyDemocrats spoke at the convention.
D．No senator spoke at the convention.
E．SomeDemocrat senators spoke at the convention.