Which of the following is the role of supporting details in a text?

A. to help the reader understand the central idea
B. to give information about topics related to the main topic
C. to give the authors opinion about a topic
D. to show the reader how to find more details about the topic in other texts

A. to help the reader understand the central idea

The role of supporting details in a text is to provide information about topics related to the main topic. Therefore, the correct answer is B. to give information about topics related to the main topic.

The role of supporting details in a text is to provide evidence, facts, or examples that support or explain the main idea or central theme. They help the reader understand and reinforce the main idea by offering additional information or context. To determine the correct answer, let's analyze each option:

A. To help the reader understand the central idea: This option accurately describes the role of supporting details. They contribute to the comprehension and clarity of the main idea by providing further information.

B. To give information about topics related to the main topic: This option is generally true as well. Supporting details often provide information that is connected to the main topic, helping the reader gain a deeper understanding of the subject matter.

C. To give the author's opinion about a topic: This option is incorrect. Supporting details typically offer factual evidence rather than the author's personal opinion. While the author's opinion may be included in the text, it is not the primary purpose of supporting details.

D. To show the reader how to find more details about the topic in other texts: This option is not the main role of supporting details. Instead, supporting details aim to provide additional information within the same text, rather than directing readers to seek further details elsewhere.

Therefore, the correct answer is A. Supporting details help the reader understand the central idea, as they provide additional information, examples, or evidence that supports the main point of the text.