A Urine Toxicology Test Reveals That a Client Has THC

A urine toxicology test reveals that a client has THC in his or her urine. This is proof that the client

A) used marijuana on one occasion in the days before the urine test.
B) is addicted to marijuana.
C) is a heavy substance abuser who is in denial.
D) has engaged in active deception to avoid family members knowing about their marijuana abuse.