An adiabatic process occurs in

Options

A. Open system
B. Closed system
C. Isolated system
D. In all the given systems

Explanation

### Step-by-Step Solution:

1. **Understanding Adiabatic Process**: An adiabatic process is defined as a thermodynamic process in which there is no heat transfer into or out of the system. This means that the system is thermally insulated.

2. **Identifying the Types of Systems**:
- **Open System**: A system that can exchange both energy and matter with its surroundings.
- **Closed System**: A system that can exchange energy (in the form of work or heat) but not matter with its surroundings.
- **Isolated System**: A system that cannot exchange either energy or matter with its surroundings.

3. **Analyzing Each System**:
- **Open System**: Since it can exchange energy and matter, it cannot be adiabatic.
- **Closed System**: It can be adiabatic if it does not exchange heat with its surroundings.
- **Isolated System**: By definition, it does not exchange heat or matter, making it inherently adiabatic.

4. **Conclusion**: An adiabatic process can occur in a closed system and an isolated system. Therefore, the correct answer is that an adiabatic process occurs in a closed system and an isolated system.

### Final Answer:
An adiabatic process occurs in closed systems and isolated systems.

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