Which of these is an acid?

1) NaOH

2) Water

3) Vinegar

4) Lye

Giving brainlest to the one who answers first and correctly!

Vinegar is the only one that is an acid

3) Vinegar

Step-by-step explanation:

Vinegar is a dilute solution of acetic acid. It has a sour taste and turns blue litmus red.

1) NaOH and 3) lye are bases. They both have a slippery feel and turn red litmus blue.

2) Water is neutral. It is neither an acid nor a base.