Sandra becomes frustrated easily and tends to oversimplify frequently. She also tends to have difficulty generalizing information. In addition to these weaknesses she possesses low self-esteem. This description of Sandra indicates that she exhibits many of the same characteristics as someone who
a. lacks consistent parental supervision.
b. comes from a low-SES family.
c. has an intellectual disability.
d. may have a severe emotional disturbance.

People who present intellectual disabilities have the characteristics described in the question, among others. Since they have problems with logical reasoning and abstract concepts, they often oversimplify things and have difficulty generalizing. Compared to other people, they commonly show poorer vocabulary and difficulty keeping up with required academic skills. They can also present difficulties concerning emotional and behavioral regulation, feeling frustrated and even angry while interacting with others. Those problems may lead to low self-esteem.