Concept:Protons and electrons are called fundamental particles because every atom contains them, and atoms make up all matter.
Explanation:Atoms are the smallest units that retain the properties of matter.
Each atom has at least one proton and one electron.
Protons are positively charged particles (
p+), and electrons are negatively charged particles (
e−).
Since all matter is composed of atoms, protons and electrons are present in all matter.
Option A is incorrect because protons can be divided into smaller particles.
Option B and Option C do not explain why these particles are described as fundamental.
Thus, the correct reason is that protons and electrons are found in all forms of matter.
Answer:D. are found in all matter