Answer:
Correct answer is (a). I have identified three factors that are contributing to the plateau of product sales
Step-by-step explanation:
Having identified the three factors responsible for steady sale, the Statement is the most correct answer because it's a direct reporting speech. It state the specialist action that was carried out in a precise way, it can otherwise be referred to as an active statement.
Using the word plateau in the statement also qualifies that the sales is at comparatively stable level rather than varies over time.