Suffix is just a smaller part of an affix, so we need to find a word that is a part of a larger group in order to complete this analogy correctly.
The correct answer is <span>dialect:language.</span>
Following- followed- followed
reading- read- read
laying- lay- laid
Not 100% sure.
Think it this way. Should humans know everything or about everything, or are there certain things humans shouldn't know about?