单项选择题

Directions: In this section,there are 10 incomplete sentence& You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center. Everyone has the right to live where he wants, ______ the color of his skin.

A. regardless of
B. in regard to
C. because of
D. owing to