Step 1:
Arthashastra is an ancient Indian treatise on polity, economics, and administration.
Step 2:
It was composed by:
\[
\boxed{\text{Kautilya (Chanakya)}}
\]
Step 3:
The Arthashastra is divided into:
\[
15 \text{ Adhikaranas}
\]
Step 4:
Thus, the correct answer is:
\[
\boxed{\text{(2) 15}}
\]