C. the Indian Ocean
Explanation:
Canada stretches from the Atlantic Ocean to the east to the Pacific Ocean to the west. To the north is the Arctic Ocean, with Greenland to the northeast.
Formed from the fragmentation of the supercontinent called Gondwana, the Indian Ocean has an extension of approximately 73.4 million square kilometers. This large body of salt water is located east of Africa, south Asia, west of Oceania and north of Antarctica. It is the only ocean of those cited in the question that does not border Canada.