What is the name of spain's longest river?

a. the melilla

b. the ebro

c. the iberia

d. the ceuta

The Ebro is the largest and voluminous river in Spain. It is born in Fontibre and flows into the Mediterranean Sea.

This river is located in the North of Spain and has a length of 910 km approximately.

The other options are incorrect because:

The Melilla  is geographically located in northern Africa (in the autonomous spanish city with the same name of the river)

The Iberia  is probably the old name of the Ebro river for its latin root word, but at present there is no river with that name in Spain.

The Ceuta is not a river, it is an autonomous spanish city, located on the Tingitana peninsula, on the African shore of the Strait of Gibraltar.