Hedwig the Owl Is Having Difficulty Localizing Sounds in Space

Hedwig the owl is having difficulty localizing sounds in space.After performing a series of studies,you realize that she has trouble localizing sounds in the left-right dimension,but she seems to know whether they are coming from above or below.Of the following choices,which brain region is the most likely to be impaired?

A) The cochlear nucleus
B) The magnocellular nucleus
C) The angular nucleus
D) The lemniscal nucleus