Answer:
The most logical answer is carton.
Step-by-step explanation:
In this question, we are working with analogies. An analogy establishes a relationship between two different things. The purpose is to compare those things by finding something that connects them, despite the differences. In this case, we have the relationship between content and container. Toothpaste is the content we find inside the tube. Tube is, thus, the container for the toothpaste. We can safely assume that, following that analogy, milk is the content. The most common container nowadays for milk is a carton. Therefore, toothpaste is to tube as milk is to carton.