What is a characteristic of Blended Grain Scotch Whisky?

Blended Grain Scotch Whisky is defined specifically as a combination of multiple Single Grain Scotch Whiskies. This form of whisky is not made primarily from malted barley, which is characteristic of Single Malt Scotch. Instead, it can include grain whiskies produced from various grains, such as corn, wheat, or even barley, but the key aspect of it being "blended" refers to the integration of several Single Grain Scotch expressions.

While it is true that Blended Grain Scotch must be aged for a minimum duration, which aligns with the regulations governing all Scotch whiskies, this aging requirement is not a distinguishing characteristic unique to Blended Grain Scotch. Additionally, the practice of adding caramel coloring is also not a defining trait of Blended Grain Scotch specifically; rather, it applies more broadly across various types of whiskies depending on regulatory practices in different regions. Thus, the defining feature of Blended Grain Scotch Whisky is its composition as a blend of Single Grain whiskies, marking option B as the correct answer.