when you are looking to round a decimal to the nearest tenth,, the first thing you need to do is to look at the first number behind the decimal. if the number is less than 5 you round down, but if it is 5 or larger then you round up. looking at the number 2.235,, you can see that the first number behind the decimal is 2 which means that we need to round down. this means the correct answer to your question is 2.2.
let me know if you have any further questions
:)