Display a question if one or the other option of a previous question is fulfilled

I’ll explain what I’m trying to do with an example:

Question A has optiona, option b and option c

Question B will be displayed if option b or option c is selected in question A.

In the image I show the form, I have tried two ways, you can see it in the relevant question 43 and the relevant question 45

Did you check your form with the Online validator: https://getodk.org/xlsform/?

Could you explain what the problem is, please, and also provide the related choice_list(s)?

@metodologia, the lower one is correct, as shown in your screenshot, if it’s the select_one question type for Question A. Is Question A a select_one or a select_multiple question? If it’s a select_multiple question type try having a look at this post discussed previously: