Final answer:
For strong third-grade spellers, the Spelling screener is appropriate as it will include words that challenge their spelling abilities, potentially involving complex sound patterns and spelling rules.
Step-by-step explanation:
The appropriate spelling screener for strong spellers in grade 3 would be a Spelling screener (option C). This screener should include words that challenge the students' abilities to spell words with more complex sound patterns. The specific words to be dictated will depend on the screener being used, but they should be suitable for the ability level of strong spellers in third grade. Words with challenging phonetic patterns such as blends, digraphs, and silent letters could be included. It's important to select words that allow students to demonstrate their understanding of spelling rules and patterns.