What happens next in this paragraph?

How to calculate market share
Determine the period you want to examine for each company you are investigating.
In order to make sure you are making an apples-to-apples comparison, you must examine sales in a specific time period. You can examine the sales over the length of a quarter, a year, or over several years.
Select from:
(a). Calculate the company's total revenue (also called total sales). All publicly-traded companies must release quarterly or annual financial statements.
(b). Market studies report that you can calculate market share by dividing your total market share by the number of shares sold. That number represents the total number of shares you need for the company to successfully manage its profit margin.
(c). You will then extrapolate your thoughts into the time period to make sure it is reasonable. If you are examining sales in a specific period, write down this information.
(d). You can multiply these two numbers by two to determine a year's time period. For example, assume you are analyzing a roughly 120% increase in sales from the years before january 1 , 2014.
(a).