Which of the following is used to make artificial eyelashes adhere or stick to the client's lash line?

Eyelash adhesive is specifically formulated to securely attach artificial eyelashes to the client's lash line. This type of adhesive is designed to provide a strong bond while remaining safe for use around the delicate eye area. It typically dries clear and allows for some flexibility, accommodating the natural movements of the eyes without causing discomfort or irritation to the skin.

Other products like eye shadow and eyeliner serve different purposes; they are used primarily for enhancing the appearance of the eyes rather than for adhering lashes. Facial glue, while generally an adhesive, may not be designed for use near the eyes and could contain harsher chemicals not suited for this sensitive application. Thus, eyelash adhesive is the most appropriate and effective choice for achieving secure and safe attachment of artificial eyelashes.