Final answer:
The sales numbers for the video-game system Odyssey were mediocre when it was introduced due to it being too expensive.
Step-by-step explanation:
The subject of this question is Business. The question revolves around the sales numbers of the video-game system Odyssey and the factors that contributed to its mediocre performance when it was introduced.
Out of the options given, the correct answer is a. It was too expensive. Price is a significant factor that can greatly influence the sales of a product. If a product is priced too high, it may discourage potential buyers from purchasing it.
In the case of Odyssey, being too expensive could have made it less appealing to consumers, resulting in mediocre sales numbers.