Which U.S. Physician Is Acting Legally

Which U.S. physician is acting legally?

A) Dr. Hamden gives a terminally ill person who says, "I want die," a prescription for a fatal medication.
B) Dr. Morella injects a fatal drug into the veins of a terminally ill person who says, "I want to die."
C) Dr. Akkarat withdraws a feeding tube from a terminally ill person who says, "I want to die."
D) Dr. Pinsky puts a fatal substance into the IV of a seriously ill person who says, "I want to die."