Which shake requires Irish Cream syrup as an ingredient?

The B-52 Crazy Shake is the correct choice because it incorporates Irish Cream syrup as one of its key ingredients. This shake is known for its rich, dessert-like flavors that blend well with the creamy texture of Irish Cream, enhancing the overall taste profile of the drink. The use of Irish Cream syrup adds a distinct sweetness and a hint of coffee flavor, characteristic of Irish Cream liqueurs, which is a popular element in many dessert-style shakes.

In the other options, the ingredients are typically focused on different flavor profiles. The Creamsicle Crazy Shake often features orange and vanilla flavors, the Grasshopper Crazy Shake is centered around mint and chocolate, and the German Chocolate Crazy Shake leans on flavors like coconut and chocolate associated with German chocolate cake. Each of these shakes has its own unique combination of ingredients that do not include Irish Cream syrup, making the B-52 Crazy Shake the standout choice for this question.