The correct option is B A collection of common names assigned to compounds.
The trivial system of nomenclature is the system of common names of compounds which can originate from their source, or a place or might even be random.
For example, HCOOH is called formic acid because they are found in ants. Ants are called formica in latin.
The main concern with this system was that there could be different names assigned to the same compound by different sets of people.