The tongue of the shoe is attached to the:

The tongue of the shoe is indeed attached to the vamp. The vamp is the upper part of the shoe that covers the top of the foot and extends from the toe to the throat, where the laces or closure system is located. This design allows the tongue, which provides comfort and helps secure the shoe when laced, to be seamlessly integrated into the overall structure. The vamp serves as the foundational base that supports not only the tongue but also contributes to the shoe's fit, style, and overall shape.

Other components such as the quarter, which refers to the sides and back of the shoe that wrap around the heel, or the welt, which is a strip that connects the upper to the sole, do not directly interact with the tongue. The toe box, on the other hand, is an area that contains the toes and does not play a role in the attachment of the tongue. Thus, the correct association of the tongue being attached to the vamp highlights the functional design of footwear.