Final answer:
Apple's iOS is a dominant player in the smartphone operating system market, which is highly competitive, especially between iOS and Android. Monopolies, contrary to point b and d, can lead to higher prices and lower output.
Step-by-step explanation:
When identifying statements about the smartphone operating system market, we should consider market structure and dynamics. Point a, stating that Apple's iOS is a dominant player, is true as iOS, alongside Android, represents a significant portion of the market. However, b is incorrect because prices are not expected to be lower in a monopoly; instead, monopolies can lead to higher prices due to the lack of competition. Point c is accurate, as the market is highly competitive, particularly between the two leading platforms, iOS and Android. Finally, point d, which suggests that output is expected to be higher in a monopoly, is false. Monopolies often result in lower output to maintain higher prices. The smartphone market, including players like Apple and Samsung, is an example of a highly competitive market rather than a monopolistic one.