The diagram below models the relative sizes of particles found in an atom. A circle with a diameter of approximately 0.25 inches. A circle with a diameter of approximately 0.875 inches.
x y

not to scale

Which list correctly identifies each particle?
x represents an electron, and y represents a proton and neutron.
x represents a proton, and y represents a neutron and electron.
x represents an electron and neutron, and y represents a proton.
x represents a neutron, and y represents an electron and proton.