Need quick bitter flavors alert us to foods that a) not taste good b) lack nutritional value c) be poisonous d) be spoiled

I would say C. Be poisonous.  Although yes bitter flavors can not taste good that's not it's main reason to alert. Bitterness is to alarm us when our food is potential danger to our health.

a. steroid--> influences moods in the limbic system

b. inhalant--> dissolves fatty tissue in the brain

c. marijuana--> changes how the hippocampus processes sensations