Light year is the unit of

Options

A. time
B. distance
C. speed of light
D. intensity of light

Answer

### Step-by-Step Solution:

1. **Understanding the Concept of Light Year**:
- A light year is defined as the distance that light travels in a vacuum in one year.

2. **Defining the Measurement**:
- Since we are measuring how far light travels, we can conclude that a light year is a measure of distance.

3. **Quantifying the Distance**:
- The actual distance that light travels in one year is approximately 9.46 x 10^15 meters. This gives us a numerical value for a light year.

4. **Identifying the Unit**:
- Since we have established that a light year measures distance, we can conclude that the unit of a light year is indeed a unit of distance.

5. **Final Conclusion**:
- Therefore, the answer to the question "Light year is the unit of?" is that it is a unit of distance.

### Final Answer:
Light year is the unit of distance.

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