When a solid body is negatively charged by friction, it means that the body has A. Acquired excess of electrons B.Lost some protons, C. Acquired some electrons and lost a lesser number of protons,D. Lost some positive ions.

When a solid body is negatively charged by friction, it means that the body has acquired an excess of electrons.

Electrons are negatively charged particles, and when two objects come into contact and undergo friction, electrons can be transferred from one object to another. If electrons are transferred from one object to another, the object that gains extra electrons becomes negatively charged. The object that loses electrons would become positively charged.

Therefore, in this scenario, option A is the correct choice: the body has acquired an excess of electrons.