Read the following article and select the best answer. Article: Captain James Cook was a great explorer. Before he started exploring, maps of the Pacific Ocean were almost empty. He visited hundreds of islands across the Pacific Ocean and put them in the correct places on the map. He made maps of the coastlines of Australia and New Zealand. James Cook was born in England in 1728. His parents were poor farm workers. When James was 18, he found a job on a coastal ship. He worked on the ship until he was 27 years old, and then he joined the navy. He fought in Canada in a war against France, and he mapped some of the eastern coasts of Canada. In 1768, King George made him Captain of a ship and sent him to the Pacific. He was gone for nearly three years. When he returned, he was regarded as a national hero. He started his third journey in 1776. On this trip he visited Hawaii. He was the first European to set foot on this beautiful island. Then he mapped the western coast of North America. After that he returned to Hawaii. Unluckily, there was some trouble between the Hawaiians and the white men and they started fighting. In the end, Captain was killed in a fight against the local. Question: He was considered a national hero because of _ . - his experience in Canada - his being the first European to visit Hawaii - his heroic death - his devotion to exploration on the Pacific Ocean
Answer:
his devotion to exploration on the Pacific Ocean