Can cause a person in, its altered state, to see colors and hear sounds.

The question is asking us to fill in the gap in the following sentence: (Gap) can cause a person in its altered state, to see colors and hear sounds. This means that the person is seeing or hearing things that are not there, but which are constructed by the action of their brain. One substance that has this effect are hallucinogens - for example certain drugs are hallucinogenic.

True, all people no matter what deserve a fair trial.

Iwould go with a or d would be your answer