Which country has the oldest national anthem?
England
Netherlands <-- right
Germany
China
Various countries including Japan, Netherlands (Holland), and Britain lay claim to having the oldest national anthem. The Japanese anthem 'The Kimigayo (the Emperor's reign)' was adopted in 1888, and was originally a poem written by Ki No Tsurayuki in the early 10th century. The music was written in 1880. The Dutch claim is based on their anthem 'The Wilhelmus' being written in 1570, but it was not adopted as the national anthem until 1932. The British national anthem was originally a patriotic song, popular in 1745 at the time of the Scots Jacobite rebellion. The song was used thereafter to greet the British monarch whenever he/she appeared in public. The original author is unknown, and it is believed to date from the mid 16th century.
To me, it looks like Japan is the right answer, though it is still ambiguous to determine when the national anthem became the national anthem (when it was written or when it was sung).
England's was adopted in 1745 (it seems) and was written in mid 16th century, 1550.
Netherland's was adopted in 1932 and was written in 1570.
Japan's was adopted in 1888 and was written 910AD.
Either way, it's not Netherlands. Delete.