Which of the following can be measured?

Options

A. Line
B. ray
C. point
D. Line segment

Answer

To solve the question "Which of the following can be measured?" we need to analyze each option provided: Line, Ray, Point, and Line Segment.

### Step-by-Step Solution:

1. **Understanding a Line**:
- A line extends infinitely in both directions. It has no endpoints.
- Since it continues indefinitely, we cannot measure its length.

**Hint**: Remember that if something has no endpoints, it cannot be measured.

2. **Understanding a Ray**:
- A ray has one endpoint and extends infinitely in one direction.
- Similar to a line, since it goes on forever in one direction, we cannot measure its length.

**Hint**: Think about how a ray only has one endpoint; it still goes on forever, making it unmeasurable.

3. **Understanding a Point**:
- A point is a specific location in space and has no dimensions (length, width, or height).
- Since it does not occupy any space, we cannot measure a point.

**Hint**: A point is just a position; it has no size to measure.

4. **Understanding a Line Segment**:
- A line segment has two endpoints and a definite length.
- We can measure the distance between these two endpoints.

**Hint**: Look for endpoints; if something has them, it can usually be measured.

### Conclusion:
After analyzing all the options, we find that only the **Line Segment** can be measured because it has defined endpoints (A and B) that allow us to determine its length. Therefore, the answer is:

**Final Answer**: Line Segment (Option 4)