The correct answer is C. A word that has the same sound as another word
Step-by-step explanation:
In language, a homophone refers to a word that has the same pronunciation or sound than another word but differs in meaning, spelling, origin, etc. An example of this are the words ate, eight or the words buy, bye that have the same pronunciation but differ in other aspects including their meaning and spelling, in this way the word "ate" is the past of "eat" while the word "eight" refers to a number. Considering this, it can be concluded a homophone which can be recognized using unsystematic spelling refers to "a word that has the same sound as another word".