"<span>a. Masters could reclaim slaves who fled to other southern states" is the best option from the list, since this was one of the most controversial acts that was one of the leading catalysts for the outbreak of the Civil War.</span>
Answer: It was added to the Constitution to protect Americans from the government from having too much power/unlimited power.
It was t<span>he </span><span>Treaties of Velasco.</span>
Possibly the last one or the third one.