Refer to the Figure

Refer to the figure.
There are three possible ways attention might affect single-cell recordings. Which way is demonstrated by the experiment whose results are illustrated in the figure?

A) Attention has globally enhanced the cell's receptive field.
B) Attention has sharpened the tuning of this cell's receptive field.
C) Attention has not affected this neuron because both stimuli are in its receptive field.
D) Attention has shifted the tuning of this cell's receptive field.