Which of the following possess hallucinogenic properties?

Options

A. (a) Erythroxylon coca
B. (b) Atropa belladona
C. (c) Datura stramonium
D. (d) All of these

Explanation

To determine which of the following possess hallucinogenic properties, we need to understand what hallucinogens are and identify examples from the given options.

### Step-by-Step Solution:

1. **Define Hallucinogens**: Hallucinogens are a class of psychoactive substances that cause alterations in perception, mood, and cognitive processes. They can induce hallucinations, which are sensory experiences that appear real but are created by the mind.

2. **Identify Types of Hallucinogens**: Hallucinogens can be classified into various categories. Some common types include:
- **Cannabinoids**: These are derived from the Cannabis plant (e.g., Cannabis sativa).
- **Cocoa Alkaloids**: These are derived from the coca plant (e.g., Erythroxylon coca).
- **Tropane Alkaloids**: These are derived from plants like Atropa belladonna and Datura stramonium.

3. **Analyze the Given Options**:
- **Option A**: Erythroxylon coca - This plant produces coca alkaloids, which have hallucinogenic properties.
- **Option B**: Atropa belladonna - This plant produces tropane alkaloids, which are known for their hallucinogenic effects.
- **Option C**: Datura stramonium - This plant also produces tropane alkaloids and is recognized for its hallucinogenic properties.

4. **Conclusion**: Since all three options (A, B, and C) produce substances that are known to have hallucinogenic properties, the correct answer is that all of these options possess hallucinogenic properties.

### Final Answer:
**All of these (A, B, and C) possess hallucinogenic properties.**