Which bone forms the heel and provides an attachment site for the Achilles tendon?

The calcaneus is the correct answer because it is the largest bone in the foot and specifically forms the heel. It plays a crucial role in weight-bearing and walking by providing a stable base. Additionally, the calcaneus serves as the attachment site for the Achilles tendon, which connects the calf muscles to the heel. This attachment is vital for activities such as walking, running, and jumping, as it allows for effective movement and force transmission from the muscles to the ground.

The other bones listed do not have the same function or characteristics as the calcaneus. The navicular, talus, and cuboid bones are important components of the foot's architecture, but they do not form the heel or provide the attachment for the Achilles tendon. The navicular and cuboid are more involved in the midfoot structure, while the talus forms the upper part of the ankle joint, playing a role in connecting the foot with the leg.