Which of the following are characteristics of children with autism spectrum disorder?
a. they show a lack of interest in playing.
b. they show severe impairments in both verbal and nonverbal communication.
c. they do not make eye contact or use their eyes to direct others’ attention.
d. they obsessively attempt to change the placement of things in their surroundings, such as furniture.
e. they focus on trivial details rather than social aspects of their surroundings.
f. they may exhibit repetitive behavior that can at times be harmful