English Skills with Readings 8th Edition by John Langan

Exercise 58

Each of the five points below is followed by two attempts at support ( a and b ). Write S (for specific ) in the space next to the one that succeeds in providing specific support for the point. Write X in the space next to the one that lacks supporting details.
My cat is extremely bright.
_____ a. He knows how to solve problems. He also recognizes people
he knows.
_______ b. When he gets locked in the basement, he simply grasps the
door latch, pulls down on it, and opens the door. He also distinguishes between family members and strangers. When a classmate of mine came by last week, my cat jumped on my lap and rubbed himself against my face, but he refused to go near our guest.