The are berber descendants who are also known as the “blue people.”
a. bedouin
b. san bushmen
c. dogon
d. tuareg

The correct answer is option D. The Tuareg are Berber descendants who are also known as the “blue people”. They are traditionally have nomadic lifestyle in the vast Sahara Desert.  They are called the "blue people" because of the color of their traditional clothing which contains an indigo pigment.