The correct answer is: B. they cause less pollution.
Leaded petrol is a type of gasoline that contains lead additives. These additives help to prevent engine knocking, but they also contribute to air pollution. Leaded petrol was banned in many countries in the 1970s and 1980s due to its harmful effects on the environment.
Lead-free petrol is a type of gasoline that does not contain lead additives. It is less polluting than leaded petrol and is therefore the preferred type of fuel for most vehicles.
Leaded petrol can cause a number of health problems, including:
- Brain damage
- Kidney damage
- Nervous system damage
- Birth defects
- Cancer
Leaded petrol can also cause environmental problems, including:
- Acid rain
- Smog
- Air pollution
- Water pollution
Lead-free petrol is a cleaner and healthier alternative to leaded petrol. It is also less likely to cause environmental problems.