Preview the following visual aid and predict the main idea of the article:
A gas mask appears over a map of the United States. A bull cow head with horns is placed over the symbol for radiation. Image is labeled Mad cow disease hits North America. It's mad to eat meat.
a.
The spread of Mad Cow Disease to North America.
c.
Diseased meat
b.
Mad Cow Disease, what you should know
d.
all of the above



Please select the best answer from the choices provided


A
B
C
D