When you drink spoiled milk or put a rancid piece of cheese in your mouth, you may spit it out before you have any cognitive awareness of why you are feeling disgusted. from an evolutionary perspective, this demonstrates which concept?

I believe the answer is: Emotions help us act with minimally conscious awareness

In this context, the emotion of disgust would most likely cause us to make attempts in order to prevent it from happening again in the future.
This would decrease our likelihood from consuming spoiled milk again by developing the habbit of checking our food before we consume it, which would help us in our survival.