Final answer:
The folds of skin on either side of the nail groove are called the nail wall or lateral nail fold. The nail fold that meets the proximal end of the nail body is called the nail cuticle or eponychium. Therefore, the correct option is 1.
Step-by-step explanation:
The folds of skin on either side of the nail groove are called the nail wall or lateral nail fold. These folds of epithelium overlap the sides of the nail body, providing support and anchoring it in place. The folds of skin on either side of the nail groove are called the nail folds. These structures help in anchoring the nail plate, or body, to the sides of the finger or toe. The nail plate is the hard, keratinous main part of the nail that is most visible. The epidermis at the sides of the nail plate forms the nail folds, and the fold that meets the proximal end of the nail plate forms the nail cuticle, also known as the eponychium. The nail fold that meets the proximal end of the nail body is called the nail cuticle or eponychium.