Manhattan island is a. the largest island in canada b. the largest island in north america c. the world’s largest barrier island d. the most highly populated island in north america

Manhattan Island is D. The most highly populated island in North America. On only 59 square kilometers there's over 1.6 million people, which is not really odd considering that it's a big corporate and tourist hub and every day millions of people go through it. It's a place for business as well with all the famous skyscrapes like the Empire state building being there.