What is an affix? a word that sounds the same as another word the beginning of a word a word part added to the beginning or end of a word the base part of a word

Based on the answer choices, I'd say the best possible answer you have is "a word part being added to the beginning or end of a word".

Here's the definition of "affix" to give you a better understanding of this concept: "an additional element placed at the beginning or end of a root, stem, or word, or in the body of a word, to modify its meaning."