Answer:
Led is a light-emitting diode, a semiconductor diode that glows when a voltage is applied. So, there is always a sure result of whether a substance conducts electricity or not as the light glows. That is why it is a better option for testing conduction of electricity.
Explanation:
A, B and D should be the ones you should check
The group of elements that have some properties of metals and some properties of nonmetals are called metalloids.
