Explanation:

Here’s the thing—when you squeeze lemon juice and mix it with baking soda, you get that classic fizz because of an acid-base reaction. Here’s what’s going on with each option:

- Option 1: Acetic acid – That’s the main acid in vinegar, not lemons.

- Option 2: Formic acid – Found in ant bites, not in lemon juice.

- Option 3: Citric acid – That’s the star player in lemon juice. When you add baking soda (sodium bicarbonate), you get a reaction producing carbon dioxide (that’s the gas making the bubbles) and sodium citrate.

- Option 4: Tartaric acid – Common in grapes and used in baking powder, but not the main acid in lemons.

So, the correct answer is:

- Option 3: citric acid