Answer: A. acts as an electrical resistance and causes the connection to heat more.
Explanation:
The wiring and connectors that carry the power to a motor must be in good condition. It should be noted that in a case whereby the connection becomes loose, then the oxidation of the copper wire occurs and thee oxidation will act as an electrical resistance and then results in the connection to heat more.
In such case, this has an effect on the electrical connection and increases the resistance. Therefore, the correct option is A.
