Rats That Have Lived for Several Weeks with Access to Only

Rats that have lived for several weeks with access to only a single laboratory chow that is devoid of thiamine

A) automatically prefer familiar foods tasting of thiamine.
B) will always learn to prefer new foods tasting of thiamine.
C) will often learn to prefer the taste of a new diet that contains thiamine.
D) sometimes learn to prefer the taste of thiamine.
E) will sometimes learn to avoid the taste of thiamine.