Final answer:
The most important question to ask when determining the topic of an informational text is who or what the text is about. This identifies the central theme around which the information is structured. Other details like author's background or supporting details are secondary in establishing the topic. The correct option is B.
Step-by-step explanation:
The question which is most important to ask when trying to figure out the topic of an informational text is B. Who or what is the text about? This is because understanding the main subject or focus of the text helps you to determine the overall topic.
To explore the topic further, we can also consider the statements that are repeated or summarize ideas, as these often hold key information about the central theme.
Additionally, while other aspects like the author's background or the number of supporting details can provide context or measure the robustness of the text's arguments, they are secondary to identifying what the text is fundamentally addressing.
When engaging with an informational text, it's also important to consider the author's reliability, whether the tone is objective, and if all relevant information is presented, which also helps in understanding the text's topic and purpose. The correct option is B.