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: Viruses are so small that they can be seen only with an electron microscope., Fact2: Viruses Viruses are very small, a few nanometers in size., Question: Objects that are a few nanometers in size can be seen only with: (A) an electron microscope (B) refraction of light (C) matter vibrating (D) ultrasound (E) The bending of a ray of light (F) slight magnification (G) flashlights (H) lens
A:
A