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The use of automobile safety seats by children aged 4 and under has nearly doubled in the past 8 years. It is clear that this increase has prevented child fatalities that otherwise would have occurred, because although the number of children aged 4 and under who were killed while riding in cars involved in accidents rose 10 percent over the past 8 years, the total number of serious automobile accidents rose by 20 percent during that period.
Which one of the following, if true, most strengthens the argument?

A. Some of the automobile safety seats purchased for children under 4 continue to be used after the child reaches the age of 5.

B. The proportion of serious automobile accidents involving child passengers has remained constant over the past 8 years.

C. Children are taking more trips in cars today than they were 8 years ago, but the average total time they spend in cars has remained constant.

D. The sharpest increase in the use of automobile safety seats over the past 8 years has been for children over the age of 2.

E. The number of fatalities among adults involved in automobile accidents rose by 10 percent over the past 8 years.

Conclusion:
The use of safety seats for kids aged 4 and below has lowered the number of child fatalities in automobile accidents.

Premise: 1. Use of safety seats has increased
2. Number of fatalities rose by only 10% although number of accidents rose by 20%.

Assumption: The proportion of accidents involving children (under the age of 4) atleast remained constant.

A. Some of the automobile safety seats purchased for children under 4 continue to be used after the child reaches the age of 5. - out of scope. we need children who are 4 or younger.

B. The proportion of serious automobile accidents involving child passengers has remained constant over the past 8 years. - BINGO.

C. Children are taking more trips in cars today than they were 8 years ago, but the average total time they spend in cars has remained constant. - Irrelevant. We are bothered about fatality rates.

D. The sharpest increase in the use of automobile safety seats over the past 8 years has been for children over the age of 2. - Irrelevant.

E. The number of fatalities among adults involved in automobile accidents rose by 10 percent over the past 8 years. - So? This does not impact the argument.

Going with B. B is tricky, but says the PROPORTION of serious auto accidents has remained constant, indicating that car accidents involving child passengers have also risen 20%.

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