The correct answer is B. The fact that the passage begins with the transitional phrase "most importantly"
Step-by-step explanation:
Order of importance is a common organizational structure used in texts; this organizational structure implies presenting the ideas from most important to less important or vice versa, which varies according to the perspective of the author and topic. Additionally, this organizational structure can be identified due to the use of transitions or expressions such as most important, first/ second/ third, in the first place, etc.
In the case of the passage presented, the section or clue that indicates this is written following order of importance structure is the use of "most importantly" at the beginning of the passage, because this explicitly shows which is the most important idea in the topic and that the passage is organized from the most important to the least important.