In recent years the Supreme Court has applied the decision across all states that individuals have the right to possess a firearm in the home for self-defense.
Which of the following is a reason for this?

1. The commerce clause guarantees the right for an individual to bear arms at the state level
2. The Supreme Court changed its interpretation of what constitutes quartering of soldiers under the Third Amendmen
3. The Supreme Court redefined what constitutes a handgun under the Second Amendment
4. The Fourteenth Amendment applies the Second Amendment to the states

3. The Supreme Court redefined what constitutes a handgun under the Second Amendment

Explanation:

When the Supreme Court enforced the decision in all states that individuals have the right to own a firearm at home for self-defense, the Supreme Court redefined what constitutes a weapon under the Second Amendment.

This is because it is the second amendment that establishes the citizen's directory and duty to provide their own security through firearms. In other words, according to any citizen amendment, regardless of gender or color, being of legal age and being psychologically healthy, you can have a firearm that guarantees your personal safety whenever necessary.

can you explain a little further maybe give multiple choice? ?