Liver cancer

[modusoperandi]

Which of the following most logically completes the passage?

A certain tropical island received food donations in the form of powdered milk for
distribution to its poorest residents, who were thought to be malnourished. Subsequently,
the rate of liver cancers among those islanders increased sharply. The donated milk was
probably to blame: recent laboratory research on rats has shown that rats briefly exposed
to the substances aflatoxin tend to develop liver cancer when fed casein, a milk protein.
This result is relevant because _______.

A. in the tropics, peanuts, a staple of these island residents, support a mold growth
that produces aflatoxin
B. the liver is more sensitive to carcinogens, of which aflatoxin may be one, than
most other bodily organs
C. casein is not the only protein contained in milk
D. powdered milk is the most appropriate form in which to send milk to a tropical
destination
E. the people who were given the donated milk had been screened for their ability to
digest milk

Official Answer to follow.

[gmattrap]

Is it A?
The rat story is a platform to provide justification for the earlier conclusion:
milk(casein)...produces... cancer(in the presence of aflatoxin)

Rats are used as experimental in place of humans.

Rats were exposed to aflatoxin, developed cancer when fed with milk protein (casein) => In the presence of tropical peanuts (source of aflatoxin), if milk is absorbed one expects to contact cancer.

[modusoperandi]

Official Answer is A

Thanks for your explaination gmattrap.