If the elasticity of crime with respect to the number of police is estimated to be -0.5 and the number of police fell by 5% and, over that same time period, homicide rates increased by 20% then
1. 15% of the increase in the homicide rate can be attributed to the decrease in the number
2. 12.5% of the increase in the homicide rate can be attributed to the decrease in the number of police
3. 2.5% of the increase in the homicide rate can be attributed to the decrease in the number of police
4. 17.5% of the increase in the homicide rate can be attributed to the decrease in the number of police
5. All of the increase in the homicide rate can be attributed to the decrease in the number of police