Correct Answer  Option 4 : three
Given numbers are: 5726489
The number of digits that remain in the same position after arrange in ascending order that is:
same position

Given Numbers

5

7

2

6

4

8

9

After arranging in ascending order

2

4

5

6

7

8

9

There are only three numbers of digits that remain in the same positions, these are 6, 8 & 9.
Hence, "Three" is the correct answer.