It is not a hotly debated topic. Rather, it is an often discussed topic among parents and educators. You are trying to create controversy where there is none and therefore, not really aligning your discussion with the original presentation.
You are using this to create a plural reference for a word that uses the same spelling to represent both its plural and singular form. You will need to adjust your English word knowledge in this case. Familiarize yourself with the plural patterns of such words.
Wrong spelling. You need to practice self-editing. Learn to proof read your paper for things such as grammar reference and spelling errors. You will lose points for each mistake you make in those sections.
This is not a well written paper if we base the score on technicalities. The examiner cannot give you a higher mark because you were not really careful in the way you developed the paper and then passed off a draft as a final copy.