Users are able to select multiple options of question.

Thank you. How about the following issue:

For a multiple choice property, some of the participants should choose all the answer in order to submit the form. See the gender question for the background Questionnaire. Some participants should choose both male and female in gender question in order to be able to submit the form. https://form.jotform.us/71285272684160

Hello minooar,

I am not sure if I have understood your question correctly. 

I did check your form and found that form "Gender" question you have added checkbox question (Multiple choice question) which allows users to select multiple options.  

Do you want to allow your users to be able to select only one option?  You need to add radio button question (Single choice question) instead of multiple choice question. Please check the screenshot below:

Alternatively you can limit the selection in checkbox question as well. Please check the screenshot below:

Hope this helps.

Do get back to us if you have any questions.

Thank you!