The answer would be Biology.
The purpose of the Louisiana purchase in 1803 was to give the United States more control of the Mississippi River, and the port city of New Orleans, which were both used by farmers to ship their crops and get paid.
The type of channel that speaker one and speaker two use in their communication would be auditory - b.
The fact that we're talking about "speaker" 1 and "speaker" 2 implies already the fact that both of them are talking and this then implies that they are using the auditory channel of communication.
The answer to your question is,
to seek optimum levels of arousal.
-Mabel <3
