Answer:
C. to know how to format the headings for each section
Step-by-step explanation:
Amir should use a style guide to know how to format the headings for each section. Style guides provide guidelines on consistent formatting, including things like font size, font type, heading hierarchy, spacing, and more. This ensures that the instructional manual is well-organized, easy to read, and follows a consistent style throughout the document. While style guides may also include guidance on other aspects of writing and formatting, their primary purpose is to provide consistency in formatting.