Question

which is a commercial use for lactic acid fermentation? making starch making bread making wine making cheese

Explanation:

Lactic acid fermentation is used in cheese - making. Bacteria perform lactic acid fermentation in milk. The lactic acid produced causes the milk proteins (casein) to coagulate, which is an important step in cheese production.
Starch is a polysaccharide made by plants through photosynthesis - related processes (not lactic acid fermentation).
Bread - making mainly involves alcoholic fermentation by yeast (producing carbon dioxide for rising, not lactic acid fermentation).
Wine - making also involves alcoholic fermentation (by yeast converting sugars to ethanol, not lactic acid fermentation).

Answer:

making cheese