Yeast's role in fermentation processes

Steps:

• Yeast ferments sugars to produce carbon dioxide (CO2) and ethanol (alcohol).
• In bread production, CO2 causes dough to rise during baking.
• In alcohol production, ethanol is the key product in beverages like beer and wine.
• Yogurt and most cheese rely on bacteria for lactic acid fermentation, not yeast.

Why C is correct:

• Yeast is essential for alcohol (via ethanol production) and bread (via CO2 leavening), matching the core uses in the option.

Why the others are wrong:

• A includes yogurt, which uses bacteria, not yeast.
• B includes cheese, which primarily uses bacteria and rennet, not yeast.
• D includes only cheese and yogurt, neither primarily using yeast.

Final answer: C