What might unbalanced wheels cause?

Answer: B — steering to vibrate

Unbalanced wheels can cause the steering to vibrate because they disrupt the smooth rotation of the wheels. This can lead to an uncomfortable and shaky driving experience, affecting the handling and stability of the vehicle. However, unbalanced wheels do not directly cause increased speed, better handling, or decreased fuel consumption. Therefore, options A, C, and D can be eliminated as possible answers.