Question

naphtha means :
a chemical used to kill pests (as rodents or insects)
a secretion in response to stress, stimulating nerve action
a volatile, flammable liquid made of hydrocarbons
a coloring material that turns red in acid solutions

Explanation:

Naphtha is a volatile, flammable liquid composed of hydrocarbons. It is commonly used in the petro - chemical industry.

Answer:

a volatile, flammable liquid made of hydrocarbons