Which Country has No Words in National Anthem?

A. Spain
B. Nigeria
C. Greenland
D. Iceland

The “Marcha Real” (Spanish pronunciation: [ˈmaɾtʃa reˈal]; “Royal March”) is the national anthem of Spain. It is one of only four national anthems in the world (along with those of Bosnia and Herzegovina, Kosovo, and San Marino) that has no official lyrics (although it had lyrics in the past, they are no longer used).