Children’s written composition was evaluated on substantive quality (ideas, organization, word choice, and sentence flow) and writing conventions (spelling, mechanics, and handwriting). Results revealed that for the substantive quality of writing, children’s grammatical knowledge, reading comprehension, letter writing automaticity, and attentiveness were uniquely related.
You need a colon after expect because if not it would be a run on sentence. If you choose any of the other answers or leave it the same it would be a run on sentence.
