In the image below, which region is showing an abnormally high sea level?

color-coded map showing the height of the world's ocean surfaces at a particular time. purple areas correspond to approximately 10 centimeters below normal. light blue areas correspond to approximately 2 centimeters below normal. green areas correspond to approximately 3 centimeters above normal. red areas correspond to approximately 10 centimeters above normal. in this map, area a is colored green, area b is colored red, area c is colored purple, and area d is colored light blue.

public domain

a
b
c
d