1. The problem asks: What is apportionment and what does it mean for U.S. representatives? 2. Apportionment is the process of dividing a set of people or objects among various individuals or groups. 3. In the context of the U.S. House of Representatives, apportionment is used to divide the available seats among the states based on population. 4. This means each state receives a number of representatives proportional to its population, ensuring fair representation. 5. Among the given options, the correct definition is option C: "Apportionment is a process used to divide a set of people or objects among various individuals or groups. In the context of the U.S. House of Representatives, it is used to divide the available seats among the states."