What is the main purpose of the book 'Economia Internacional: Teoria e Política'?

A) To present a confusing array of models and special assumptions that make it difficult to extract basic conclusions.
B) To offer an updated and understandable analytical framework to shed light on current issues and bring the excitement of international economics to the classroom.
C) To assume that the reader has a broad economic background and to focus on theoretical formalisms.
D) To leave a gap between the relatively outdated material that is explained in class and the exciting issues that dominate current research and political debates.