Sophie often makes grammatical errors in her document. which feature of the spelling and grammar tool can she use to understand the errors?
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Since Sophie often makes a lot of grammatical and spelling errors in her document, it might be best for her to use a feature available in Microsoft Word that would help her better in understanding what her mistakes are, which is something that (D) Explain does.

Explain would tell Sophie which part of her sentence is wrong, or what word did she mistype, and what better way to phrase a sentence to avoid fragmented ones.