Which One of the Following Statements Is True Concerning the Proton

Multiple Choice

Which one of the following statements is true concerning the proton?

A) The proton cannot be further subdivided.
B) The proton is composed of two up quarks and a down quark.
C) The proton is composed of two down quarks and an up quark.
D) The proton is composed of a down quark and an up antiquark.
E) The proton is composed of an up quark and a down antiquark.