Final answer:
The author's claim in 'Clean Cars for California' is that clean cars will reduce pollution and benefit everyone.
Step-by-step explanation:
The best statement that expresses the author's claim in 'Clean Cars for California' is b) Clean cars will reduce pollution and benefit everyone.
The passage mentions that electric vehicles do not pollute as they are driven, and hybrid vehicles can largely remedy the emission and fuel economy problems with automobiles. This indicates that clean cars can help reduce pollution. Furthermore, the passage mentions that these improvements can benefit everyone by providing maximum economy with minimum emissions.