The location of conscious thought processes and the origin of all complex intellectual functions is the

The correct answer is the cerebrum.
The cerebrum (which means 'brain' in Latin) is a large part of our brain which contains many of its areas, and is tasked with many processes in our bodies and brains. For example, this is the center for voluntary actions; apart from that, the cerebrum is tasked with regulating thoughts, perception, memory, judgment, etc.