According to your text,some researchers believe that autism spectrum disorder may be due to:

A) rigid myelination.
B) abnormal development of the corpus callosum.
C) lesions in the prefrontal cortex.
D) incomplete axon cords.

Corpus Callosum

A thick band of nerve fibers that divides the cerebrum into left and right hemispheres, facilitating communication between the two sides of the brain.

Autism Spectrum Disorder

A range of neurodevelopmental conditions characterized by challenges with social skills, repetitive behaviors, and communication, with symptoms and severities that vary widely among individuals.

Myelination

The process of forming a myelin sheath around the nerves to increase the speed at which impulses propagate along the myelinated fiber.