Final answer:
Cloudy plastic milk bottles block light to some extent, but cardboard milk containers are the most effective at preventing light penetration, which helps preserve milk's nutritional content. The correct option is A.
Step-by-step explanation:
The question is discussing light transmission through different types of packaging materials for milk. While cloudy plastic milk bottles may block some light, cardboard milk containers are superior in preventing light penetration, helping to preserve the quality and nutritional content of the milk inside.
This is important because exposure to light can degrade certain nutrients in milk, especially vitamin A and riboflavin. Packaging materials like polycarbonate and other plastics find numerous applications beyond beverage and food packaging, including compact discs, prescription glasses, and automotive parts, for their transparency, durability, and range of properties.