Drugs that break down a psychological barrier against doing other drugs are known as a industrial drugs b gateway drug c first use of drugs

The answer to this is B gateway drugs as they act as a gateway to use other drugs

The right answer is (B) Gateway Drugs

Gateway drugs are those chemicals or substances that, when consumed for longer time, give way to harder and more dangerous drugs. These dangerous substances, such as nicotine or alcohol are believed to open the door to drugs such as meth, heroin and cocaine, which can lead to addiction and serious harm to human health. Marijuana, cigarettes and alcohol are the examples of gateway drugs.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.