The correct answer is option 1: acetone. Nail polish remover is primarily composed of acetone, which is a colorless liquid with a strong smell. It is commonly used as a solvent for removing nail polish from nails. Acetone is effective in dissolving and breaking down the chemicals in nail polish, allowing it to be easily wiped away.

Option 2: benzene, is incorrect. While benzene is a solvent commonly used in industrial processes, it is not typically found in nail polish removers. Benzene is a known carcinogen and is highly toxic, so it is not suitable for use in personal care products like nail polish removers.

Option 3: petroleum ether, is also incorrect. Petroleum ether is a petroleum distillate that is often used as a solvent, but it is not a common ingredient in nail polish removers. It has a strong odor and can be flammable, making it less suitable for use in personal care products.

Option 4: acetic acid, is incorrect. Acetic acid, also known as vinegar, is not typically found in nail polish removers. Although it is a common household item used for cleaning, it is not effective in removing nail polish.

Therefore, the correct option is option 1: acet