Final answer:
The correct analogy to the situation where audio recordings reduce sales of printed books is when the introduction of a new brand of soft drink leads to reduced consumption of an established brand.
Step-by-step explanation:
The principle illustrated by the statement regarding the decline in sales of printed books due to the wider commercial availability of audio recordings is that when a new product or technology enters the market, it can displace older products or services by offering a more desirable alternative. The option that conforms most closely to this principle is (C) Because a new brand of soft drink entered the market, consumers reduced their consumption of an established brand of soft drink. This alternative directly competes with another product in the market and leads to reduced consumption of the established product, akin to the way audio recordings have impacted sales of printed books.