Final answer:
The Maglemosian and Tardenoisian cultures are the two prehistoric cultures from the Mesolithic period in Europe known for their unique archaeological artifacts and sites.
Step-by-step explanation:
The two prehistoric cultures associated with the Mesolithic period in Europe and known for their distinctive archaeological artifacts and sites are Maglemosian and Tardenoisian (Answer B). The Maglemosian culture, known for its use of microliths and fishing-related artifacts, flourished in Northern Europe. The Tardenoisian culture, identified by small flint blades known as Tardenoisian points, was mainly found in France and Belgium. These cultures succeeded the older Paleolithic cultures and preceded the emergence of the Neolithic period, which saw the advent of agriculture and settled communities.