Final answer:
The main focus when determining the scope of an instructional unit in science is to identify the content standards that will be covered in the unit.
Step-by-step explanation:
When determining the scope of an instructional unit in science, a teacher will primarily identify B. The content standards that are to be covered within the unit. This is an essential step because it informs what content to include or assign, guiding student expectations and learning outcomes. Educational standards set clear, concise, and measurable objectives that are part of a pedagogical framework helping students structure their learning. With a focus on both content and practice, such as the seven science practices identified in the AP® Biology course, teachers integrate skills like scientific inquiry and the use of models to solve problems, which are essential for mastering the subject matter.