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

Color-coded map showing the height of the world's ocean surfaces at a particular time. Purple areas correspond to 25 to 35 centimeters below normal. Light blue areas correspond to 5 to 15 centimeters below normal. Gray areas correspond to 0 centimeters above or below normal. Yellow areas correspond to 5 to 15 centimeters above normal. White areas correspond to 35 to 50 centimeters above normal. In this map, area A is colored purple, area B is colored white, area C is colored yellow, and area D is colored light blue.

Public Domain

A
B
C
D