According to the Common Core standards for language progressive skills, what is the earliest grade in which a student would be expected to produce complete sentences?

The requirement for students to produce complete sentences is introduced as part of the foundational skills in language development early in their education. By first grade, students are expected to start using complete sentences in their speech and writing as they expand their vocabulary and develop their understanding of syntax and grammar. However, more explicit expectations for producing well-structured, grammatically correct complete sentences, particularly in writing activities, are established in the early stages of the Common Core standards.

By third grade, students are expected to demonstrate greater complexity in their writing and to produce sentences that not only are complete but also connect ideas and express more thoughtful content. This aligns with expectations for their cognitive development and literacy skills as they learn to effectively communicate in written form. Therefore, while the foundation for complete sentences begins earlier, the proficiency level expected is more clearly articulated by third grade, making that the correct choice.