What feature is common among all chocolates used at Graeter's?

The correct answer highlights the unique quality of Graeter's chocolates, which is the diversified texture. Graeter's is known for its artisanal production methods, particularly the French pot process, which creates a creamy texture that distinguishes their products. This method allows for larger chocolate chunks to remain within the chocolate, adding a rich and varied texture to each bite.

In contrast, while some chocolates may indeed have high sugar content or contain vanilla, these features are not as defining to all the chocolates used at Graeter's. The emphasis on a high cocoa percentage is also common in many chocolate brands but does not specifically reflect the hallmark of Graeter's offerings. Thus, diversified texture is the key characteristic that sets their chocolates apart, making it the best representation of what is common among all chocolates used at Graeter's.