Answer: a) temporal lobe of the cortex
Step-by-step explanation:
Auditory cortex is the section of temporal lobe that process auditory information into brain through hearing for further operation.It can perform high level hearing related function.
According to the question,Otto will find that temporal lobe of cortex is the section that consist auditory cortex in auditory system for processing heard information to brain and thus, his brain can listen sound of the video.
Other options are incorrect because fusiform sound areas, prefrontal cortex with limbic system and ventromedical hypothalamus is not the section which contains auditory cortex of making sense of sound. Thus, the correct option is option(a).