25 Since road traffic is a significant contributing factor to greenhouse gas emissions, major cities in the world are starting to reduce their traffic volume by implementing a congestion charge. (A)Major cities in the world charge drivers for causing traffic jams and emitting harmful gas into the air. (B)Major cities in the world will be charged because they are major contributors to the greenhouse effect. (C)Major cities in the world will be charged for causing heavy traffic on their streets and for contributing to the greenhouse effect. (D)Major cities in the world begin to charge drivers for speed driving that contributes to greenhouse gas emissions.