What intervention would best support a second-grade student who relies on invented spellings?

The choice of providing instruction in complex phonics patterns is particularly effective for a second-grade student who relies on invented spellings because it builds on the foundational understanding of phonics that the student may already possess. At this stage, students begin to encounter more complex sounds and spelling rules. Teaching them about these patterns can help them understand the relationship between sounds and letters, which is crucial for accurate spelling.

By focusing on complex phonics patterns, the student can enhance their phonemic awareness and improve their ability to decode and encode words correctly. This understanding will enable the student to transition from invented spellings to more conventional spelling, which reflects a deeper mastery of the language.

In contrast, strategies for memorizing letter sequences and using repeated readings do not specifically address the gap in understanding complex sounds and their spellings, which is what the student needs most at this point. Structural analysis, while beneficial for comprehending word parts and meanings, may not directly impact the student’s spelling abilities as effectively as a targeted approach to phonics would. Therefore, the instruction in complex phonics patterns is the most suitable intervention for supporting this student's spelling development.