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: if a neutral atom loses an electron then an atom with a negative charge will be formed, Fact2: When an atom or molecule is no longer neutral it is called an ion ., Question: if an atom loses an what it forms an ion (A) energy (B) Energy. (C) heat energy (D) electron (E) nucleus (F) vaporization (G) neutron (H) bond
A: 
D