To summarize the central idea in a text, readers should identify the topic and then identify
a.) little-known facts about the topic.
b.) the author's opinion about the topic.
c.) other readers' opinions about the topic.
d.) scientific facts about the topic.

Step 1:  Determine which options are correct

To summarize the central idea in a text, readers should identify the topic and then identify

- Option B:  the author's opinion about the topic.

The option that makes sense is Option B because in order to summarize the central idea, the readers should also identify the author's opinion in order to get the full picture of what the author wrote.

Look at attachment

i don't see any questions on your profile, currently, but i'd be happy to try and with any problems that you have, so long as i understand the problem myself.