Hi Tom,
Starting by the question itself, it is not from any official OutSystems exam or sample / practice test. Can you tell me where did you find it?
This question doesn't follow our guidelines and best practices, where the use of terms like "which options is not false" or double negatives are avoided. Even the wording is very confusing and makes the question really hard to understand. What does it mean to "set a text value to an integer"? Is it to type a text into an input widget of type Integer? Or the other way around? Again, this is another reason for excluding this question from one of our exams.
From my understanding of the question, I agree with your interpretation and the 4th option seems to be indeed the correct one.
Are you going for the Mobile Developer Specialization? If that's the case you can find an official sample test in the certification page.
Hope this helps and good luck
Jorge Costa