Read the passage from when birds get flu and cows go mad! by john diconsiglio.

perhaps the best news about mad cow is that people do not catch it easily. chances are, millions of people have eaten infected beef. but, for reasons scientists still do not understand, only about 150 people have gotten vcjd and died from it.

the tone of the passage is
a. anxious.
b. excited.
c. reassuring.
d. unhappy.