1. Microsoft Power BI Documentation
"Line charts in Power BI": "Line charts are a great choice... to visualize data over a long period of time." This supports using a line chart to show balances by quarter (Option A).
2. Microsoft Power BI Documentation
"Create ribbon charts in Power BI": "Ribbon charts are best for showing a category's rank change. The ribbon for the category with the highest rank (value) is always displayed on top of the other ribbons." This directly supports using a ribbon chart to analyze the changing composition and ranking of accounts over time (Option E).
3. Microsoft Power BI Documentation
"Visualization types in Power BI": This document describes the appropriate use cases for various visuals. It notes that pie charts are best with fewer than eight categories and that clustered column charts are for comparing multiple measures
which can become cluttered without filtering (supporting the rejection of Options D and B).