According to CPT, in which of the following cases would an established E/M code be used?

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According to CPT, in which of the following cases would an established E/M code be used?

A. A home visit with a 45-year-old male with a long history of drug abuse and alcoholism. The man is seen at the request of Adult Protective Services for an assessment of his mental capabilities.
B. John and his family have just moved to town. John has asthma and requires medication to control the problem. He has an appointment with Dr. You and will bring his records from his previous physician.
C. Tom is seen by Dr. X for a score throat. Dr. X is on-call for Tom’s regular physician, Dr. Y. The last time that Tom saw Dr. Y was a couple of years ago.
D. A 78-year-old female with weight loss and progressive agitation over the past 2 months is seen by her primary care physician for drug therapy. She has not seen her primary care physician in 4 years.