Cahn Denies That One Can Base the Wrongness of Murder

Cahn denies that one can base the wrongness of murder on God's existence because

A) perhaps God gave us the potential to murder because murder is right.
B) some things potentially created by God, such as vermin and disease, are not wrong to kill.
C) death is part of life, so perhaps God's gift of life implies a duty to kill.
D) All of the above