What was an achievement of the Maurya Empire? A
the unification northern India

B
the adoption and spread of Islam

C
the defeat of the Mongolian Empire

D
the creation of the Silk Road trade route

the answer is d.index

answer; education;

the secretary of defense is the principal defense policy advisor to the president. under the direction of the president, the secretary exercises authority, direction, and control over the department of defense.

as you did not provide any choices for me to choose from to give you a direct answer, this is the only information i can provide.