Answer:
It will be difficult for Mary to compare the crime rates in a U.S. city with her hometown of London, England:
b. There are differences in the way crime is measured.
Step-by-step explanation:
- The option a is not correct as it is not true that England doesn't have any crime statistics that are available to civilians.
- The option b is correct as the ways of measuring crimes are different for different regions or places.
- The option c is not correct as there is no dictatorship in England.
- The option d is not correct as it is not true that only solved cases are included in England's crime rates.