The correct answer is C. Compare and contrast
Step-by-step explanation:
In the text presented, its author points out a similarity between the three branches of government "Each is an important part of government" and also explains the differences between these, especially how they differ in their roles. This can be seen in "The legislative branch writes the bills that will become laws" or in "the judicial branch decides whether laws are constitutional". In this context, the text compares the branches of government and contrasts them or shows its difference, therefore the structure is compare and contrast.