• Zero ” is an important part of the number system. The right plural form for the noun “ zero ” is option C. 
• It's formed by adding the suffix ‘- es ’ towards the end of the noun “ zero ”. 
• Option A, “ zero ” isn't a plural form at each, it's the same word as the noun “ zero ”. 
• Option B is incorrect because there's no similar word as ‘ zeroe ’ in the English language, it does n’t fit in any format of plural words moreover. This word doesn't live. 
• Option C, “ zeroz ” does n’t live in English language, moreover. As an illustration, the noun “ idol ” can also be written in its plural form as “ icons ”.

Hence, option C is the correct answer.