In which year, the absolute difference of the students in two schools is the lowest ?

Options

A. 2008
B. 2011
C. 2009
D. 2012

Answer

To find the year in which the absolute difference of the number of students in two schools is the lowest, we will analyze the data provided for each year.

### Step-by-Step Solution:

1. **Identify the years and student numbers**:
- 2008: School A = 640, School B = 550
- 2009: School A = 820, School B = 800
- 2011: School A = 750, School B = 700
- 2012: School A = 900, School B = 500

2. **Calculate the absolute differences for each year**:
- **2008**:
- Difference = |640 - 550| = 90
- **2009**:
- Difference = |820 - 800| = 20
- **2011**:
- Difference = |750 - 700| = 50
- **2012**:
- Difference = |900 - 500| = 400

3. **Compare the differences**:
- 2008: 90
- 2009: 20
- 2011: 50
- 2012: 400

4. **Identify the lowest difference**:
- The lowest absolute difference is 20, which occurs in the year **2009**.

5. **Conclusion**:
- Therefore, the year in which the absolute difference of the students in the two schools is the lowest is **2009**.