There is asimpleexplanation for mysister's attitude:She is too young to understand is correctlypunctuated. Thus, optionDis correct.What is a sentence?Asentencecan be defined as the part where the phrase and the words are. This often contains asubjectand apredicate. For a sentence, it needs to begrammaticallycorrect. Also, there should be proper punctuation marks that are needed in a sentence. It can contain a noun or a pronoun. The sentence helps in communicating the thoughts.There are various things that were to be taken into account to note that thesentenceis correctly formed likesister's,full stopandcolonis used to make the sentence that is correctly formed. "There is a simple explanation for my sister's attitude: She is too young to understand". is correctly formed.  Therefore, optionDis the correct option.Learn more aboutsentence, here:brainly.com/question/27891489#SPJ2...

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