Answer:
d. port cities engaged in trade around the Pacific Rim.
Step-by-step explanation:
San Diego, Los Angeles, San Francisco, Portland, Seattle, and Vancouver are all port cities that are actively engaged in trade around the Pacific Rim. These cities have access to the Pacific Ocean and serve as important hubs for international trade, commerce, and shipping. Their strategic coastal locations make them key centers for economic activities and facilitate connections with other countries and regions in the Pacific Rim.