Which Statement About Mice Genetically Engineered to Overexpress $\Delta$ FosB in the Dorsal Striatum and Nucleus Accumbens Relative to in the Dorsal

Which statement about mice genetically engineered to overexpress $\Delta$ FosB in the dorsal striatum and nucleus accumbens relative to wild-type mice is false?

A) They develop a conditioned place preference for cocaine and morphine at lower doses.
B) They show an increased locomotor response to cocaine.
C) They show a greater reduction in anxiety in response to alcohol.
D) They do not develop physical dependence, withdrawal, or tolerance to morphine.