Select the phrases or clauses that need to be revised. Glen is writing about the benefits of using digital textbooks. He must review his writing and check for sentence structure. His teacher noted some phrases and clauses that do not create complete sentences.

How does the map develop the central idea that scholars at jundi shapur spread the knowledge of sugar? the map illustrates the spread of sugar from new guinea to persia. the map shows that sugar was being refined primarily in the north rather than the south. the map illustrates the spread of knowledge about refined sugar processing to egypt. the map illustrates that people in china knew how to refine sugar and shared this knowledge. the answer is c