Detailed Instructions: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Q: Fact1: an electron microscope is used for seeing very small objects by making them appear bigger, Fact2: Electron microscopes use a beam of electrons as their source of illumination., Question: To make very small objects appear bigger, one can use what instead of light for illumination? (A) electricity (B) electron beam (C) by indirect light (D) reflecting light (E) photons (F) Electrical energy (G) heat energy (H) mirrors
A:
B