Prior to the new police patrolling program, which requires police cars to patrol various areas of the city every hour, the sale of burglar alarms in the city was high. However, since the new program has been initiated, people are no longer buying those expensive equipments. Clearly, the people in the city are feeling a lot safer.
The argument above is based on which of the following assumptions?
(A) The number of households in the city has remained the same over the duration of this study.
(B) The new police patrolling program has been able to bring the crime rate down in the city.
(C) The price of the burglar alarms has remained steady over the duration of this study.
(D) The performance of the burglar alarms has not impacted the sale of these alarms.
(E) People’s buying behavior of safety equipments is a reasonable indication of the degree to which they feel safe in their city.