Question

how does an object become negatively charged?
it gains electrons.
it loses electrons.
it gains protons.
it loses protons.

Explanation:

Electrons are negatively - charged particles. When an object gains electrons, it has an excess of negative charge and becomes negatively charged. Protons are positively - charged and are in the nucleus, not easily transferred in normal charging processes. Losing electrons makes an object positively charged.

Answer:

It gains electrons.