Garcia and His Colleagues Conducted a Series of Studies on Conditioned

Garcia and his colleagues conducted a series of studies on conditioned taste aversion.Which finding is NOT relevant to the results of their research

A)  Taste-nausea associations were almost impossible to prevent. 
B)  Odour-nausea associations were almost impossible to prevent. 
C)  Both taste-nausea and odour-nausea associations were impossible to prevent. 
D)  Researchers were able to prevent taste-nausea associations but not odour-nausea associations.