learning styles results questionnaire in storyline


I am building a questionnaire for learning styles in storyline, where the user selects options in multiple choice questions. Each selected answer adds a point to a particular variable and calculates the total in the results slide. Now, I am struggling to find a trigger to add these values up. The trigger I have chosen is "Adjust variable" to value "1", when the user click answer "x" etc. So, what happens in the end is that each result box just shows "1". How do I get the selected answers to add up as points in the end? Is there a trigger that says "add value 1 to the variable when the answer is created? I just can't seem to find it in my trigger options. Thanks for helping in advance.

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