How is the House Margarita served when blended?

The House Margarita, when blended, is served in a pint glass. This choice is correct because pint glasses are designed to hold a significant volume of liquid, making them ideal for blended drinks like margaritas that often require a larger serving size. The wide opening of a pint glass also allows for easy sipping and enhances the overall drinking experience, which is why it's a popular choice for cocktails that are served frozen or blended.

The other glass options, while they may be used for different drinks, do not offer the same volume capacity. A rocks glass, for example, is typically used for neat or on-the-rocks drinks, while a tall glass might be more suitable for cocktails that require more mix-specific ingredients. Lastly, a cocktail glass, also known as a coupe or martini glass, is primarily used for serving stirred or shaken cocktails, which wouldn’t apply to a blended House Margarita. This context illustrates why the pint glass is the appropriate choice for serving this particular drink.