How is sulfur related to the methyl

Explanation:

Carbonic acid (H2CO3) is formed when vinegar (CH3COOH) and baking soda (NAHCO3) are mixed which is unstable and decomposes to produce CO2. This is what will make the bubble rise and fizz steadily to the top of the volcano.

CH3COOH + NAHCO3 ⇄  CH3COONa + H2CO3

H2CO3 ⇒  H2O + CO2

Vinegar is dilute Acetic acid, the reaction equilibrium will be shifted to the product side upon the addition of more vinegar. Hence, more H2CO3 will form, that is more CO2 will form. This would lead to more bubbles arising.

Therefore,  the answer is option B - adding excess vinegar to drive the reaction equilibrium to the product side.