Final answer:
A Spelling screener is the best choice for grades 2 and 3 students who struggle with spelling, as it evaluates various aspects of their spelling skills.
Step-by-step explanation:
The appropriate spelling screener for weak spellers in grades 2 and 3 would be option C, the Spelling screener. This screener is designed to assess and identify specific areas where a student may be experiencing difficulties with spelling.
Through exercises like underlining letters that spell specific sounds, sorting words based on phonetic patterns, counting letters and sounds, and identifying different spellings for sounds such as [k], [sh], [ch], and [b], a Spelling screener provides a comprehensive evaluation of a child's spelling abilities.
It is particularly beneficial for students at this developmental stage, as it can effectively pinpoint the foundational spelling skills they need to improve upon.