Here is your answer:
When doing problems like these your are talking about place values and they are really simple to do. Just do it this way:

- As you can see this is a decimal number:
- Usually it would be 9 but hear is the case you want to know the tenths place value but since it's a decimal it would be 5:


Therefore your answer is option B "5." Just remember when talking about decimal the tenths place value is on the right of the decimal point.
Hope this helps!