Final answer:
According to EU labeling laws, if a bottle of wine specifies a single variety, 85% of the wine must be from that variety, ensuring consumer information accuracy.
Step-by-step explanation:
Under EU labeling laws, if a single variety is stated on the label of a bottle of wine, then 85% of the wine must be from that specified variety. This regulation is designed to ensure authenticity and traceability of wine products within the European Union, providing consumers with accurate information about the wines they purchase. It is part of the EU's broader food and beverage labeling laws which seek to protect both consumers and producers by maintaining high standards for product information.