In a public park of the Beegappel metropolitan where biodegradable bags were provided at strategic points, the amount of exposed dog excrement per square foot on average was lower than the average of the same ratio of the metropolitan's parks that did not supply the bags, by almost 7 times. In light of this result, the Beegappel municipality decided to install the same system of provided bags in another three parks in the neighborhood. Residents used the bags and the results were the same as with the experiment in the first park. It is clear that if the bags were supplied in parks in all neighborhoods of the metropolitan, then all the parks would enjoy lower amounts of dog excrement per square foot.

The author's conclusion relies on which of the following assumptions?

A) The cleanliness of public parks is important in terms of hygiene and the prevention of illnesses.
B) The Beegappel municipality is determined to reduce the amount of exposed excrement in its parks.
C) The amount of other forms of garbage dispersed is the same in all the parks of Beegappel.
D) In the three parks that had the same system installed, the amount of dog excrement was also reduced to 7 times lower than the average.
E) The cleanliness of public parks is equally important to the residents of differing neighborhoods.

OA E

Source: Economist GMAT