What happens as a result of tyre pressures being well below the recommended levels?

You selected both answer 1 (Fuel consumption increases) and answer 2 (Tyre wear increases), which are correct. When tyre pressures are much lower than recommended, there is more rolling resistance between the tyres and the road. This higher resistance means the engine needs to work harder, increasing fuel consumption. Additionally, tyres that are underinflated wear out more quickly and unevenly because they do not make proper contact with the road. The statement that "pollutant emission decreases" is incorrect; in fact, lower tyre pressure actually increases emissions because of higher fuel use. Always keep tyre pressure at the recommended level for optimal safety, efficiency, and environmental protection.