Final answer:
The best method to teach first-graders about correct writing mechanics is by emphasizing punctuation during read-alouds, allowing them to understand its practical use.
Step-by-step explanation:
The method that best fosters first-grade students' ability to use correct mechanics, such as punctuation and capitalization in their own writing, is C. Emphasizing pauses indicated by punctuation during read-alouds. This approach allows students to hear how punctuation changes the pace and meaning of sentences, which can then be reflected in their writing. Using mentor texts can also be effective, as it encourages students to imitate good writing practices. While assigning worksheets from a workbook and having students copy rules are traditional methods, they are often less engaging and may not effectively transfer to students' original writing.