Critical Reasoning

In Australia the population that is of driving age has
grown larger over the last five years, but the annual
nurnber of traffic fatalities has declined' This leads to
the conclusion that, overall, the driving-age
population of Australia consists of more skillful
drivers now than five years ago.
Each of the statements below, if true, weakens the
argument EXCEPT:
(A) Three years ago, a mandatory seat-belt law
went into effect throughout Australia'
(B) Five years ago, Australia began a major road
repair project.
(C) Because of increases in the price of fuel,
Australians on average drive less each year
than in the preceding year.
(D) The number of hospital emergency facilities in
Australia has doubled in the last five years'
(E) In response to an increase in traffic fatalities,
Australia instituted a program of mandatory
driver education five years ago.

[spoiler]the author says that annual
nurnber of traffic fatalities has declined over the five years ..but A doesn't give any reason for deaths to be lower in the first two years of the five years..so cant A be selected on basis of this reasoning ..I considered E to be alternate cause ,since they are educated they know road signs better and drive with care .. nothing to do with their inborn skills[/spoiler]