Final answer:
The human A1 auditory area, responsible for processing auditory information, is found in Heschl's gyrus, which is the primary auditory cortex (D).
Step-by-step explanation:
The human A1 auditory area is found in D) Heschl's gyrus. Heschl's gyrus is located in the temporal lobe and corresponds to Brodmann's areas 41 and 42, which are the primary auditory cortex.
It is responsible for processing auditory information.
The other options listed do not correspond to the primary auditory area; the planum temporale is involved in processing language and music, Wernicke's area is associated with language comprehension, and Broca's area is associated with language production.