Answer: The manger was built for heavy weights.
Step-by-step explanation: The word "manger" is a noun used to refer to a large open box from which animals such as horses feed. Mangers are usually found in barns since they are mainly used to feed animals that live in farms. In that way, "manger" is related to the context of the sentence provided since a manger is an object that can be built to support great amounts of food. In contrast, the word "manager" cannot fill in the blank because it makes reference to a person and a person cannot be "built".