Answer:
a. To present supporting evidence
b. To introduce ideas
c. To present a convincing argument
Step-by-step explanation:
The primary purpose of informational text is to convey information and provide facts on a given topic. Therefore, presenting supporting evidence and introducing ideas are key purposes of informational text. Additionally, a convincing argument may be presented in informational text, depending on the purpose of the text. However, conveying emotions is not a primary purpose of informational text, as it is primarily focused on providing factual information rather than evoking emotional responses.