Food that makes people sick will often:
a) taste sour or bitter
b) smell slightly woodsy
c) look bumpy with odd color
d) look and smell fine

D. Usually we get food poisoning from food we think is totally fine.

Explanation:

The answer to this question is: Look bumpy with odd color

Food that look bumpy with odd color often caused by the growth of Fungus on top of the food's surface.

This could make the food taste either sour or bitter. Eating such foods will often cause several problems such as fever and diarrhea.