Which of the following best explains why ten of the former Confederate states rewrote or amended their state constitutions?

a. They were required to rewrite their state constitutions according to the terms of the surrender treaty.

b. They hoped to remodel their constitutions to resemble the national constitution.

c. It was an effort to disenfranchise black voters and restrict their rights and freedoms.

d. It is a standard pattern for states to rewrite their constitutions once every fifty years.