Paraphrase: Choose the choice that best explains the meaning of the original sentence. When there is an absence of reliable information about drugs, the risks involved in using them are greatly increased.

A、There is no reliable information about drugs.;
B、There are no risks involved in using drugs if we have reliable information about them.;
C、The risks involved in using drugs have increased.;
D、Using drugs is more dangerous when we don’t know what effects and danger are involved.