Step 1: Scan the passage for a text name.
The first paragraph names exactly one book in connection with perfumes, the Brhatsamhita by Varahamihira.
Step 2: Read what it says about that book.
It lists scented bathing water, scented hair oil, perfume for cloths and scented tooth sticks as items described in it.
Step 3: Compare the options.
Arthashastra is about the state and the economy. Hitopadesha and Panchtantra are fable collections. None of these is named in the passage for perfumes.
Step 4: Answer.
The text named in the passage is the Brhatsamhita, which is option 2.
Step 5: Second check.
A quick second check is to ask what kind of book each option is. Arthashastra is a manual of kingship, Hitopadesha and Panchtantra are story books for moral lessons, and Brhatsamhita is a large encyclopedia of science and daily life by an astronomer. Only an encyclopedia like the Brhatsamhita would list perfumes, hair oils and tooth sticks, and the passage agrees. So option 2 is final.
Final Answer:
The Brhatsamhita is correct, option 2.
\[\boxed{\text{Option 2}}\]