Final answer:
The part of Congress designed to give all states equal representation is the Senate. (Option b)
Step-by-step explanation:
Each state, regardless of its size or population, is represented by two senators in the Senate. This equal representation in the Senate was established as a compromise during the Constitutional Convention of 1787 between states with larger and smaller populations.
In contrast, the House of Representatives, which is the other chamber of Congress, is based on proportional representation. The number of representatives in the House is determined by each state's population. States with larger populations have more representatives, while those with smaller populations have fewer.
The combination of equal representation in the Senate and proportional representation in the House was a key aspect of the Great Compromise, ensuring that both the interests of individual states and the population as a whole were represented in the federal legislature.
Therefore, the correct answer is: b) Senate