Fill in the blank. CO2 dragster racing is often called "______ on steroids."

• NASCAR
  Because it's so similar to the Pinewood Derby, where small wooden cars are raced on a downhill track, CO2 dragster racing is called the "Pinewood Derby on steroids." That's because the cars are similar, but CO2 Dragsters use propulsion instead of gravity to race.
• the Pinewood Derby
  Because it's so similar to the Pinewood Derby, where small wooden cars are raced on a downhill track, CO2 dragster racing is called the "Pinewood Derby on steroids." That's because the cars are similar, but CO2 Dragsters use propulsion instead of gravity to race.
• slot car racing
  Because it's so similar to the Pinewood Derby, where small wooden cars are raced on a downhill track, CO2 dragster racing is called the "Pinewood Derby on steroids." That's because the cars are similar, but CO2 Dragsters use propulsion instead of gravity to race.