In your public speaking class, you are asked to evaluate the delivery of a classmate. You critique her vocal characteristics, eye contact, gestures, and appearance, but find that you can really only pay attention to one category at a time. Your experiences support what challenge of interpreting nonverbal messages?
Nonverbal cues are multichanneled

Nonverbal cues are multichanneled

Explanation:

Based on the scenario being described within the question it can be said that the reason for this is that Nonverbal cues are multichanneled. Meaning that these are all cues/gestures that can only be observed. Therefore you can only pay attention to one cue at a time, unlike speech where you can actually see the individual talking and listen to them.

the minoan civilization flourished in the middle bronze age on the island of crete located in the eastern mediterranean from c. 2000 bce until c. 1500 bce. with their unique art and architecture, and the spread of their ideas through contact with other cultures across the aegean, the minoans made a significant contribution to the development of western european civilization as it is known today. labyrinth-like palace complexes, vivid frescoes depicting scenes such as bull-leaping and processions, fine gold jewelry, elegant stone vases, and pottery with vibrant decorations of marine life are all particular features of minoan crete.  

so basically their unique way of ding arts, as well as architecture.