What aspect of literacy instruction is addressed when explaining that "c" is followed by "i," "e," or "y" to make the /s/ sound?

The correct choice highlights the relationship between letters and their sounds in particular contexts, which is a fundamental aspect of orthography. When discussing that the letter "c" produces the /s/ sound when it is followed by "i," "e," or "y," it specifically pertains to the rules of spelling and sound, illustrating how letters interact in written language.

Orthography involves the conventions of spelling, including the ways in which letters and letter combinations represent sounds in a language. Understanding that "c" followed by "i," "e," or "y" results in the /s/ sound is essential for students as they learn to decode and spell words correctly. This phonetic rule helps students grasp the complexities of written language, aiding in their overall development in literacy.

This focus on the relationship between letters and sounds is critical in helping students read fluently and accurately, as well as in fostering their writing skills.