E-commerce is available just about everywhere and anytime. This is known as：

E-commerce is available just about everywhere and anytime. This is known as：
A、richness
B、information density
C、ubiquity
D、reach
正确答案：C
答案解析：
Option A： Richness refers to the depth and detail of information that can be transmitted in a marketing message or on an e - commerce platform. For example， a product page with high - quality images， detailed descriptions， and customer reviews showcases richness. It has nothing to do with the availability of e - commerce everywhere and anytime， so this option is incorrect.
Option B： Information density is about the total amount of information available to all market participants， including price， product features， and so on. It is not related to the aspect of e - commerce being available at all times and in all places， so this option is wrong.
Option C： Ubiquity means that e - commerce is available everywhere and at any time. Consumers can access e - commerce platforms from their desktops， laptops， tablets， or smartphones， whether at home， at work， or on the go， and at any hour of the day or night. This option correctly describes the given characteristic， so it is the right answer.
Option D： Reach pertains to the number of people or the extent of the audience that a marketing message or an e - commerce site can reach. It does not refer to the availability of e - commerce in different locations and at different times， so this option is incorrect.