Why do colds cause us to lose some of our appreciation for the taste of food?

a. cold viruses denature olfactory neurons, thus dulling the perception of taste.

b. the symptoms of colds prevent stimuli from reaching olfactory neurons efficiently, thus dulling the perception of taste.

c. cold viruses lower the firing threshold of olfactory neurons, thus dulling the perception of taste.

d. the symptoms of colds interfere with the stimuli reaching the taste bud receptors, thus dulling the perception of taste.

e. cold viruses raise the firing threshold of olfactory neurons, thus dulling the perception of taste?