What are the errors in their experimental procedure? HELP !!?

Some scientists are testing a culture of cells to determine if fermentation is occurring. They incubate the cells in a glucose solution in the presence of oxygen. After a period of time they measure the culture solutions for the presence of carbon dioxide gas, which they know is a product made during fermentation... show more Some scientists are testing a culture of cells to determine if fermentation is occurring. They incubate the cells in a glucose solution in the presence of oxygen. After a period of time they measure the culture solutions for the presence of carbon dioxide gas, which they know is a product made during fermentation What are the errors in their experimental procedure?
Select all that apply
A) Carbon dioxide gas is not given off by all types of fermentation, b) Fermentation does not use glucose as a reactant,
C) Carbon dioxide gas is also given off by aerobic respiration.
D) Aerobic respiration could occur instead of fermentation if oxygen is present.
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