When they finished eating, all the boy's faces were covered in tomato sauce is the incorrect sentence. Thus, option B is correct.
What is a grammatical or spelling error?
The systematic process of characters to create a word is referred to as spelling. The term won't be written correctly and won't understand if those characters were not really constructed appropriately. The proper placement of letters to create a phrase is referred to as grammar.
In this sentence, the in-corrections were about the singular and plural verb and noun which were related to they, all, and boys. They, the plural was employed incorrectly for a singular object boy, and as a result, it indicates a grammatical mistake.
The correct statement will be when they finished eating, all the boys' faces were covered in tomato sauce. Therefore, option B is the correct option.
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