The incidence in japan of most types of cancer is remarkably low compa

Agree with D. The safest deduction.

Already disccused at the below thread:
cr-cancer-2636.html
I did this by POE
The incidence in japan of most types of cancer is remarkably low compared to that in North America , especially considering that japan has a modern life style, industrial pollution included. The cancer rates, however, for japanese people who immigrate to north america and adopt the diet of north americans approximate the higher cancer rates prevalent in north america

If the statements above are true, they provide the most support for which one of the following?
A. the greater the level of industrial pollution in a country, the higher that country's cancer rate will tend to be.
the argument
though there is no info but close enough lets park it for a while B. the stress of life in north american is greater than that of life in japan and predisposes to cancer.
there can be reasons other than stress : we do not know and hence out of scope
C. the staple foods of the japanese diet contain elements that cure cancer.
though there is no info but close enough lets park it for a while
D. the relatively low rate of cancer among people in japan does not result from a high frequency of a protective genetic trait among japanese people
E. The higher cancer rates of japanese immigrants to north america are cused by fats in the north american diet.
again lets not mix our impression about or general perception about American food with facts given in the question . Diet could also mean a change in eating habits ....
I am torn between B and D. Can someone please help why and how to negate B?

Already disccused at the below thread:
cr-cancer-2636.html

The incidence in japan of most types of cancer is remarkably low compared to that in North America , especially considering that japan has a modern life style, industrial pollution included. The cancer rates, however, for japanese people who immigrate to north america and adopt the diet of north americans approximate the higher cancer rates prevalent in north america

If the statements above are true, they provide the most support for which one of the following?
A. the greater the level of industrial pollution in a country, the higher that country's cancer rate will tend to be.
B. the stress of life in north american is greater than that of life in japan and predisposes to cancer.
C. the staple foods of the japanese diet contain elements that cure cancer.
D. the relatively low rate of cancer among people in japan does not result from a high frequency of a protective genetic trait among japanese people
E. The higher cancer rates of japanese immigrants to north america are cused by fats in the north american diet.

I am torn between B and D. Can someone please help why and how to negate B?

E
Short-listed D and E
Assumption negation - E stands, D doesn't
Experts, please advise.