One of the following statements contains a word used incorrectly or inappropriately. Choose the option which has the incorrect or inappropriate usage of the word.

Question and options

1. To keep the key safe, she wore it on a cord around her neck.
2. He purchased a cord of wood from the market.
3. Teenagers may feel a need to cut the umbilical cord tying them to their homes.
4. The musician would hear a cord in his head and play each note individually.