Final answer:
Flint didn't like his brother's plan because it went against their values.
Step-by-step explanation:
Flint didn't like his brother's plan because it went against their values. This means that option D) It went against their values is the correct answer. Sometimes people disagree with a plan because it conflicts with their personal beliefs or principles, and this seems to be the case for Flint and his brother. It's important to have open discussions and respect different perspectives when considering different plans or ideas.