What substances can be synthesized in clandestine laboratories?

The correct answer identifies various illegal drugs that are commonly produced in clandestine laboratories, specifically heroin, cocaine, and methamphetamine. These substances require complex chemical processes for their synthesis, which often occur in hidden locations to evade law enforcement and bypass regulatory controls.

Heroin is made from morphine, which is derived from opium poppies, and its production involves several chemical reactions. Cocaine, extracted from the coca plant, is processed into a white powder or converted into crack cocaine through chemical manipulation. Methamphetamine is typically synthesized from readily available chemicals in a series of chemical reactions that can be quite hazardous.

The other choices are limited to specific substances or categories that do not encapsulate the broader range of illicit drugs commonly made in these labs. For example, marijuana can be grown but does not require lab synthesis in the same manner as the drugs listed in the correct answer, and while alcohol and tobacco can have legal and illicit production methods, they aren't synthesized in clandestine labs in the context often examined within law enforcement practice. Lastly, the mention of only meth is too narrow since multiple substances are associated with clandestine lab activities. Thus, the correct answer reflects a more comprehensive understanding of the types of drugs synthesized in these illegal operations.