Final answer:
Option b best supports Part A as it underlines the system of checks and balances designed to prevent the concentration of power within a few hands.
Step-by-step explanation:
The best detail from the text that supports the answer to Part A regarding the legislative process and the system of checks and balances is option b) "Our founders didn't want a process where just a few people would have the power to quickly be able to make all the laws." (Paragraph 2). This statement underscores the intention behind the procedures outlined in Section 7 of the United States Constitution where both houses of Congress must agree on the bill, and then it is sent to the President for approval. This complex process ensures that multiple entities have to consent for a bill to become law, which is a key feature of the system of checks and balances designed to prevent any single branch or group from having unilateral power over legislation.