Look at the map.

A map of North America and the Caribbean Islands. Arrow 1 points to an island just off the eastern shore of Canada. Arrow 2 points to the largest island in the Caribbean, directly south of Florida. Arrow 3 points to an island just to the east of Cuba. Arrow 4 points to an island to the east of the Dominican Republic.
Which number on the map shows Puerto Rico?
1
2
3
4