What effects can result from taking drugs?

The selected combination is correct because all three effects – impairment of concentration, increased readiness to take risks, and a miscalculation of speeds – are recognized consequences of drug use that impact driving ability. According to German traffic regulations, driving under the influence of drugs is strictly prohibited as it significantly increases the risk of accidents. These impairments can lead to serious road safety issues, which is why it's crucial for drivers to understand that any form of drug use can adversely affect their capacity to operate a vehicle safely. Recognizing all these factors is essential for responsible driving behavior and compliance with the law.