Scoring for Multi-Response Questions

I would like to give partial credit for each correct response to a multi-response question. I thought I could do this by choosing Score By Choice but the option is not available for a multi-response question.  Is there a way that I can do this?

Example:

The following are colors in the rainbow. (Choose all that apply.)

Red

Green

Fuschia

Indigo

If some chose Red and Green but did not choose indigo, I would want to give them partial credit.

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