The unit of time is :

Options

A. light year
B. parsec
C. leap year
D. angstrom

Explanation

To determine the correct unit of time from the given options, we will analyze each option step by step.

### Step 1: Analyze each option
- **Option 1: Light year**
A light year is a unit of distance. It is defined as the distance that light travels in a vacuum in one Julian year (approximately 365.25 days). Therefore, this is not a unit of time.

- **Option 2: Perseic**
The term "Perseic" is not a standard unit of measurement in physics. However, if it refers to "parsec," it is also a unit of distance used in astronomy to measure large distances to astronomical objects. Hence, this is not a unit of time.

- **Option 3: Leap year**
A leap year is a time measurement that occurs every four years to help synchronize the calendar year with the solar year. A leap year has 366 days instead of the usual 365 days. Since it is a measure of time, this could be a valid option.

- **Option 4: Angstrom**
An angstrom is a unit of length equal to 10^-10 meters. It is commonly used to measure wavelengths of light and atomic scales. Therefore, this is also not a unit of time.

### Step 2: Conclusion
From the analysis, the only option that represents a unit of time is **Option 3: Leap year**.

### Final Answer
The unit of time is **Leap year**.

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