The correct answer is A) Ice Sarnia. The Canadian Coast Guard's Ice Sarnia office is the primary point of contact for commercial ships or other persons/agencies requiring the assistance of Canadian Coast Guard icebreakers. This is because Ice Sarnia is responsible for coordinating and managing icebreaker operations in Canadian waters. By contacting Ice Sarnia first, the request can be properly routed to the appropriate icebreaker assigned to the specific area, rather than directly contacting the icebreaker itself. The other options are incorrect because B) the Canadian Coast Guard is too broad, C) the Ice Navigation Center is not the correct point of contact, and D) directly contacting the icebreaker assigned to the area would bypass the proper coordination process managed by Ice Sarnia.