Which country was the first to adopt Bitcoin as legal tender in 2021?
Correct answer
Answer A: El Salvador.
Detailed explanation
The question concerns a historical event: in 2021, El Salvador became the first country to introduce Bitcoin with legal tender status. The key points here are the country and the year of that introduction.
Legal status should be distinguished from the network's technical operation and from actual everyday use. A country can set payment rules without thereby determining Bitcoin's consensus rules for all participants.
The supplied card also takes subsequent legislative changes into account. The historical answer therefore does not mean that all the acceptance obligations or other features of that status remain unchanged today. Statements about a specific payment today must be checked against the rules in force at that time.
Common misconception
Once introduced, a legal status does not have to remain unchanged forever. Its historical first introduction and the current legal position are different questions.