The Most Commonly Used Commercial Method to Extract Delta-9-Tetrahydrocannabinol (THC)

The most commonly used commercial method to extract delta-9-tetrahydrocannabinol (THC) from the cannabis plant material is by:

A) pouring vegetable oil on the plant materials and soaking them for 10 days.
B) sieving powdered plant material along with an inorganic solvent through a filtered vessel.
C) using liquid carbon dioxide to produce oils or other forms.
D) squeezing the plant material using a pressing machine to extract oils.