Question

all of the following are barriers to contamination except for: ph adjustment sanitized utensils hand - washing informing consumers about potential physical hazards

Explanation:

pH adjustment can control microbial growth and chemical reactions to prevent contamination. Sanitized utensils reduce microbial load. Hand - washing removes contaminants from hands. Informing consumers about hazards is a communication step and not a direct barrier to contamination like the others.

Answer:

informing consumers about potential physical hazards