Final answer:
To monitor manned aircraft and ATC communications near Minot International Airport while the control tower is operational, the appropriate frequency is CT-118.2.
Step-by-step explanation:
If you have received authorization from ATC to operate a small UA near Minot International Airport (MOT) while the control tower is operational, the correct frequency to monitor manned aircraft and ATC communications is CT-118.2. The UNICOM frequency is typically used for non-controlled airports to communicate with the airport operator or other local traffic, and the ASOS frequency provides automated weather observations. The Control Tower frequency (CT-118.2) is the designated frequency for two-way communication with the control tower, which manages aircraft within the airspace.