The venn diagram compares protons with electrons. which
shared property belongs in the region marked "b"?
is found in the nucleus
has mass of 1 amu
orbits the nucleus
is electrically charged

The shared property between proton and electron is electrically charged which belong to the Region B marked.

Electrons and protons posses the property known as electric charge which affects the interaction with particles of electrically charged. Electrons  posses negative charge and protons have positive charge. Since the charges are opposite they act like opposite poles of magnet. The opposite charges repel each each other.

The electrons and protons are hold together by the attraction between them. An atom is electrically neutral which insist that the negative charge of the electron which is exactly equal to the protons positive charge.

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i hope this