Cortical projections that excite striatal cells participating in the direct pathway lead to inhibition of the

A) Globus pallidus internus and substantia nigra, pars reticulata
B) Globus pallidus internus and substantia nigra, pars compacta
C) Globus pallidus externus and substantia nigra, pars compacta
D) Globus pallidus externus and substantia nigra, pars reticulata