Suppose that, in each trial, either electrons or protons had been added to each sphere to

Suppose that, in each trial, either electrons or protons had been added to each sphere to produce its charge. In Trial 3, which of the 2 types of particles would have been added to Sphere X, and which of the 2 types of particles would have been added to Sphere Y ？

A.electrons；protons

B.protons；electrons

C.electrons；electrons

D.protons；protons

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