Hello Magdalena, we’re so glad you enjoyed the first course :). For that quiz question, the answers are a) alkaloids & c) flavonoids.
Primary metabolites in plants are essential nutrients such as zinc, vitamin C, carbohydrates and proteins. Secondary metabolites are more specifically medicinal compounds, including alkaloids, flavonoids, glycosides, tannins and essential oils. Apologies if in the class flavonoids weren’t mentioned. I hope this clears up your question. You can go back and re-take the quiz if you’d like.