Answer:
It would be D.
This is a box of 100 squares, and you can see that there are 10 shaded per row. You can see that there are 8 rows completely shaded, plus 2 of them shaded in another row.
8 x 10 = 80
80 + 2 = 82
Now, to turn it into a decimal, turn the number 82 into a decimal, which is 0.82