One of the External Costs Associated with Illegal Methamphetamine Production

One of the external costs associated with illegal methamphetamine production is the

A) Increased difficulty of purchasing some over-the-counter cold medications.
B) Substitution of somewhat less effective ingredients in some over-the-counter cold medications.
C) Increased difficulty illegal methamphetamine producers face in obtaining their ingredients.
D) Increased difficulty of purchasing some over-the-counter cold medications as well as a substitution of somewhat less effective ingredients in some over-the-counter cold medications.