Answer: B) Insulators
Step-by-step explanation:
The material that does not allow the easy flow of electrons through it is called an insulator.
1. Conductors are materials that allow the easy flow of electrons. They have a large number of free electrons that can move freely within the material, conducting electric current. Examples of conductors include metals like copper and aluminum.
2. Insulators, on the other hand, do not allow the easy flow of electrons. They have tightly bound electrons that are not able to move freely. This prevents the flow of electric current. Examples of insulators include rubber, glass, and plastic.
3. Semi-conductors are a special category of materials that have properties between conductors and insulators. They can conduct electricity under certain conditions but not as easily as conductors. Examples of semi-conductors include silicon and germanium.
4. The nucleus, as mentioned in option d, is not a material but rather a part of an atom. The nucleus contains protons and neutrons, and it does not play a role in the flow of electrons through materials.
Therefore, the correct answer is b. Insulators. Insulators do not allow the easy flow of electrons through them.
I hope this helps :)