The correct answer is "tenths".

Please Recall the Place Value Chart.
For Example: The number 123.45 can be represented in the place value chart as:

Solution:

We write the given number in the place value chart.

To identify the place of the digit 8 in the number 0.8, we look for the position of 8 in the place value chart.

So, in number 0.8, the digit 8 is in the tenths place.