The correct answer is: B. Alloys which contain mercury as one of the contents.
Amalgams are alloys that contain mercury as one of the components. They are typically used in dentistry, as fillings for teeth. Amalgams are also used in some industrial applications, such as in electrical contacts and switches.
Option A is incorrect because amalgams are not necessarily highly colored. The color of an amalgam depends on the other metals that are present in the alloy.
Option C is incorrect because amalgams do not necessarily have great resistance to abrasion. The resistance to abrasion of an amalgam depends on the other metals that are present in the alloy.
Option D is incorrect because amalgams do not necessarily contain carbon. The only metal that is always present in an amalgam is mercury.