Fatalities in road accidents are typically directly proportional to th

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Fatalities in road accidents are typically directly proportional to the number of road accidents in a country. In Bumbletown, the number of road accidents last year has increased by 15% compared to the year before. Clearly, the number of fatalities can be expected to increase by a similar proportion. However, government officials claim that the number of fatalities last year actually decreased compared to the year before.

Which of the following, if true, does most to justify the government officials’ claim?

(A) Last year, out of all passengers that travelled on road, the proportion of passengers wearing a seat belt has been significantly higher than the year before.
(B) Last year, there was a significant increase in the sales of the Government-approved safety guidelines book “How to drive safely to avoid an accident”.
(C) The proportion of emergency medical personnel in the country has increased last year.
(D) Most of the road accidents last year were between the recently introduced self-driving cargo-carriers that were doing test runs without any human involvement.
(E) There has been a consistent decrease in the number of fatalities in road accidents over a five-year period before last year.

Simplify the argument:
Last year number of accidents increased, but number of fatalities decreased. Possible reasons: The vehicles were of improved standard, or the medical facilities improved.
A. This could be possible. But you have to assume that increased usage of seat belt decreases the number of fatalities. Keep it.
B. This does not work. Because we already know accidents were 15 % more, only that fatalities were fewer.
C. We have to assume a lot of things here. The emergency personnel were responsible for the reduced fatalities.
D. Bingo. This says the accidents did not involve any humans at all. This should be it.
E. Does not work. A general statement.
D is correct.