Please help I don’t know the difference between affect and effect

Explanation:

Affect and effect are easy to mix up. Here’s the short version of how to use effect vs. affect. Affect is usually a verb, and it means to impact or change. The effect is usually a noun, an effect is the result of a change. Watch out! There are certain situations and fixed phrases that break the general usage rules for these words.

c. barbarians with unexpected intelligence  

i would say the correct answer is not concrete.