Monocular deprivation of cats during the critical period (about four through twelve weeks after birth) results in profound and irreversible effects on:

A) retinal responses.
B) LGN neuron responses.
C) the initial formation of ocular dominance columns in layer 4 of primary visual cortex.
D) the consolidation of ocular dominance columns in layer 4 of primary visual cortex.
E) All of the above