Multiple anwers questions marl allocation.

Storyline evaluates multiple-response questions by checking whether the learner’s selections exactly match the responses marked as correct in Form View. If all three responses are marked as correct, the question will only be scored as correct if the learner selects all three — no more, no less. Selecting only two correct responses will result in the question being marked incorrect.

To work around this, you can create a custom interaction using individual checkboxes and custom triggers to define your own validation logic, disguised as a True/False (or other) graded question.

How it works?

Add a True/False graded question to your project, and draw a white rectangle over the slide to visually hide the default question layout. In Form View, mark "True" as the correct response.

Next, insert 5 custom checkboxes on the slide. Then, create a trigger that adjusts the True/False variable based on the learner’s selections according to your custom validation logic. 

Example:
The answer is considered correct if any or all of checkboxes 1, 2, and 3 are selected. If either checkbox 4 or 5 is selected, the answer is marked incorrect.
Trigger:

A simple .story file is attached for reference.