When should you question a sources credibility? ? a. when you cannot find any other sources that support its argumentsb. when the arguments made by the author of the source are consistent  c. when the source has been translated from another language  d. when you find multiple additional sources that support its arguments 

Which of these is not a criticism of the concentric zone model? it does not accurately describe cities after the rise of suburban development. it only applies to cities that grew after the development of the automobile. it assumes that inner-city areas will always be repurposed instead of abandoned. it places too much importance on the traditional central business district.