Final answer:
Reviewing each paragraph's topic sentence carefully is an effective step in finding the main idea of a text, as these sentences often summarize the central point of each paragraph and support the thesis.
Step-by-step explanation:
To find the main idea of a text, one effective step is c) reviewing each paragraph's topic sentence carefully. Topic sentences typically encapsulate the main point of the paragraph and support the overall thesis of the work. By examining these sentences, readers can better understand how each paragraph contributes to the author's central argument or theme. It is also crucial to ensure that supporting evidence from primary and secondary sources is integrated to provide a sense of completeness and answer any important questions outlined in the assignment instructions.