Generally, to make the plural of most words, we add an 's' at the end. However, there are certain exceptions and the word 'data' is one of them. We also do not add an apostrophe (the symbol ') to form plurals, rather we use it show possession. This rules out Options A) and B); and Option D) is incorrect as it is not even a word. The correct answer is Option C) - data. The word 'data' is the specific plural for the singular form 'datum' , making this an exceptional case.