Hi!
The correct answer would be A. anagrams
This is because nemesis and enemy have many of the same letters and if it was the word "enemies" it would be even closer to "nemesis".
An anagram is when you take the letters of a word and put them in a different order to get another word, for example, the word "sword" anagrams to "words".
-ASIAX ∵Frequent Answerer∴