Explanation:

To find the correct number from the given options, we need to understand the pattern or rule that is being followed.

Pattern:
- The given number is a combination of smaller numbers.
- Each smaller number is obtained by multiplying a digit by a power of 10.
- The powers of 10 used are in descending order from left to right.

Analysis:
Let's analyze the given number and break it down into its smaller components:

- 7000000000: This can be broken down into 7 x 1,000,000,000.
- 500000000: This can be broken down into 5 x 100,000,000.
- 800000: This can be broken down into 8 x 100,000.
- 600: This can be broken down into 6 x 100.
- 9: This is a standalone number.

Using the Pattern:
Now, let's use the pattern we identified to find the correct number from the given options:

- Option A: 7500800609
- This can be broken down into 7 x 1,000,000,000 + 500,000,000 + 8 x 100,000 + 600 + 9.
- This matches the pattern we identified and is equal to the given number.

- Option B: 7508000609
- This can be broken down into 7 x 1,000,000,000 + 500 x 1,000,000 + 8 x 100,000 + 600 + 9.
- This does not match the pattern as the second component is multiplied by 1,000,000 instead of 100,000,000.

- Option C: 7500080609
- This can be broken down into 7 x 1,000,000,000 + 500,000,000 + 80 x 1,000 + 600 + 9.
- This does not match the pattern as the third component is multiplied by 1,000 instead of 100,000.

- Option D: 7500806009
- This can be broken down into 7 x 1,000,000,000 + 500,000,000 + 8 x 100,000 + 600 x 1,000 + 9.
- This does not match the pattern as the fourth component is multiplied by 1,000 instead of 100.

Conclusion:
Based on the analysis and using the pattern, the correct number is option A: 7500800609, as it matches the given number and follows the pattern of multiplying digits by powers of 10 in descending order.

D is the answer