The correct answer is a. Lpt.
LPS is lipopolysaccharide located in the outer membrane (OM) of the unique lipid bilayer ofGram-negative bacteria. Gram-negative bacteria containins Lpt or the lipopolysaccharide transport systems which is responsible for transporting LPS. It consists of seven known LPS transport proteins.
Explanation:
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The changes in the grape juice happened due to the alcoholic fermentation of the grape juice that occurs due to the presence of aerobic bacteria. The presence of yeast is the main reason behind the process of fermentation taking place. The froth is produced due to the presence of the formation of acid and carbon dioxide.