challenge: What is the standard for evaluating state laws that burden interstate commerce but do not discriminate against it?
  
  A. The law is invalid if its burden on interstate commerce is not outweighed by its legitimate health and safety benefits
  B. The law is valid if it only affects intrastate commerce
  C. The law is per se invalid if it has any impact on interstate commerce
  D. The law is valid if enacted for a legitimate health and safety reason and no reasonable alternative means exists
  Answer: 