Fill in the blanks:
Q. A surface that extends endlessly in all directions is called a ______.

Options

A. Axis
B. Line
C. Plane
D. None of the above

Answer

To solve the question, we need to fill in the blank with the correct term that describes a surface extending endlessly in all directions.

### Step-by-Step Solution:

1. **Understand the Question**: The question states that we need to identify a surface that extends endlessly in all directions.

2. **Identify Key Terms**: The key phrases here are "extends endlessly" and "in all directions."

3. **Recall Definitions**:
- A **point** has no dimensions.
- A **line** extends in one dimension.
- A **plane** extends in two dimensions and can go infinitely in all directions.

4. **Match Properties**: Since we are looking for a surface that extends endlessly in all directions, we can conclude that it must be a plane.

5. **Fill in the Blank**: Based on our understanding, we can fill in the blank: "A surface that extends endlessly in all directions is called a **plane**."

### Final Answer:
A surface that extends endlessly in all directions is called a **plane**.

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