Final answer:
The key tool to the Vikings' success as merchants, marauders, and explorers was the Viking longships. Longships were highly crafted ships designed for speed, agility, and warfare. They allowed the Vikings to sail into shallow waters and explore new territories.
Step-by-step explanation:
The key tool to the Vikings' success as merchants, marauders, and explorers was the Viking longships (option A).Longships were highly crafted ships designed for speed, agility, and warfare. They allowed the Vikings to sail into shallow waters and explore new territories. These ships were crucial for the Vikings' ability to trade, raid, and navigate across long distances.Viking longships were a combination of oars and sails, using both manpower and the wind for propulsion. They provided the Vikings with unprecedented mobility and allowed them to conduct invasions and establish settlements, spreading their influence across Europe.