Validity. i am not so sure though!<span />
<span>b. People felt that the Constitution did not sufficiently protect their rights.* </span>
I believe the answer is: <span>formal operational
During </span>formal operational stage, most people would started to develop the ability to develop abstract concept which granted us the ability to create a hypothesis. On average, <span>formal operational stage happen when we're around 12 years old or older.</span>