Here is my understanding of the argument:
The chances of contracting a disease depend more on lifestyle than on your genetic makeup. For example, statistically, a sixty-year old man living a San-Franciscan lifestyle has a 5 percent chance of having a heart attack soon while for a sixty-year man living a Japanese lifestyle, that probability is just 1 percent, statistically. On the other hand, Studies have shown that the risk of heart attack at 60 for Japanese people who adopt the San Franciscan lifestyle is also closer to 5%.
Which of the following can be inferred if the information above is considered true:
(A)person’s genetics make up has little impact while determining their likelihood of having a heart attack
(B)Heart attacks are virtually non-existent for people younger than 60 years of age.
(C)When determining the probability of heart attack of identical groups of Japanese people at 60, a greater weight should be given to the kind of lifestyle they lead than to their genetic makeup.
(D)A diet composed of shellfish, such as those consumed by Japanese, helps prevent coronary heart disease more than a beef filled diet prevalent in the west.
(E)The live expectancy of Japanese people living in San-Francisco is lower than those who live in Japan.
Major focus is required on lifestyle, we need to see if there is any option that is talking something related to lifestyle:
(A)person’s genetics make up has little impact while determining their likelihood of having a heart attack
The argument only talks about "contracting a disease depend more on lifestyle than on your genetic makeup". It does not quantify anything related to genetics.(B)Heart attacks are virtually non-existent for people younger than 60 years of age.
Cannot be inferred from the argument. It only talks about 60 years of age as an example.(C)When determining the probability of heart attack of identical groups of Japanese people at 60, a greater weight should be given to the kind of lifestyle they lead than to their genetic makeup.
So here the author is talking about lifestyle. Identical Groups, Different Lifestyles.. Keep It.(D)A diet composed of shellfish, such as those consumed by Japanese, helps prevent coronary heart disease more than a beef filled diet prevalent in the west.
Cannot be sure of the fact that lifestyle only means "kind of diet"(E)The live expectancy of Japanese people living in San-Francisco is lower than those who live in Japan.
The argument is only talking about contracting a disease eg Heart attack. There is nothing with respect to "live expectancy".Therefore, C is the best answer.