Correct Response: C. To address the difficulties expressed by the English language learners in the scenario, the teacher not only needs to alter his/her speech but also must employ strategies for clarifying requirements of academic assignments. By explicitly explaining the components and processes involved in completing an academic task and providing models of what a good completed product should look like, the content-area teacher can provide English language learners with the scaffolds they need to complete an assignment successfully. A is incorrect because, while students' first language may be used in some instances to support learning in an SEI classroom, SEI models do not rely on first-language instruction. B is incorrect because long-term content objectives and course goals are not focused on specific strategies for addressing students' needs. D is incorrect because, though student interaction is an important component of an effective SEI model, it does not help a teacher adapt his/her speech or clarify an academic task.