Final answer:
The red mushroom, specifically fly agaric, is often mentioned in myths as being consumed by Vikings before battle to increase bravery, but there is no conclusive evidence to support this historical claim.
Thus, the correct option is 1.
Step-by-step explanation:
The question pertains to the historical account of the substances Vikings might have ingested before battle. There is a popular myth suggesting Vikings consumed mushrooms to enhance their bravery and ferocity in combat.
While stories often mention the red mushroom, specifically fly agaric (Amanita muscaria), the truth of these accounts is debated among historians. The psychoactive properties of the red mushroom are well known, and its consumption could result in effects that might have been interpreted as 'increased bravery.'
However, there is no conclusive evidence to support the claim that Vikings used this or any specific mushroom for such purpose before battle.
When dealing with legends and ancient history, it's essential to consult scholarly sources and recognize the distinction between myth and verified historical facts.
Therefore,the correct option is 1) Red.