Choose the correct option for each question. There is only one correct response for each question.
Which of these entities is responsible for moving an object?

Options

A. Speed
B. Acceleration
C. Balanced forces
D. unbalanced force

Answer

To solve the question, "Which of these entities is responsible for moving an object?", we will analyze the given options and understand the concepts of motion and forces.

### Step-by-Step Solution:

1. **Understanding Motion**:
- Motion refers to the change in position of an object with respect to time. To initiate motion, a force must be applied.

2. **Identifying the Options**:
- The question provides several entities as options. We need to evaluate each one to determine which is responsible for moving an object.

3. **Evaluating Speed**:
- Speed is a measure of how fast an object is moving. However, it does not cause motion; it describes the motion once it has started. Therefore, speed is not responsible for moving an object.

4. **Evaluating Acceleration**:
- Acceleration is the rate of change of velocity. While it occurs when an object is moving, it does not initiate motion by itself. It is a result of applying a force. Thus, acceleration is also not responsible for moving an object.

5. **Identifying the Role of Forces**:
- Forces are the key entities that cause motion. Specifically, unbalanced forces are required to change the state of motion of an object. When the net force acting on an object is not zero, it can cause the object to accelerate and thus move.

6. **Conclusion**:
- The correct answer is that **unbalanced forces** are responsible for moving an object. They create a net force that can change the object's state from rest to motion.

### Final Answer:
The correct option is **unbalanced forces**.

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