Question

Europeans who wanted to map new regions explored the Arctic in the 1500s. John Davis, for whom the Davis Strait is named, trekked to Sanderson’s Hope in 1587. Britain, whose explorers were among the most persistent, continued to explore the Arctic for the next 400 years.
Identify the adjective clause.

A. for the next 400 years
B. who wanted to map new regions
C. to Sanderson’s Hope in 1587

Answer 1

"A. for the next 400 years " Is your answer.

Answer 2

...who wanted to map new regions...

The adjective clause who wanted to map new regions describes what kind of European.