This question tests the understanding of why knowledge of the Canadian Constitution is crucial for journalists, especially those covering political stories. The text suggests that such knowledge is necessary for competent reporting on political stories. Option B is the correct answer because understanding the legal boundaries within which the state operates is fundamental for accurate and informed reporting. This knowledge allows journalists to contextualize political actions and decisions within the framework of the Constitution. Option A, while related, focuses more on the ability to critique rather than understand and report. Option C is incorrect as it suggests alignment with the government's perspective, which is not the role of journalists. Option D is also incorrect because participating in constitutional debates is not a journalist's responsibility. Thus, B is the best explanation for the necessity of a clear grasp of the Canadian Constitution for journalists.