Final Answer:
The drying time for the thickest nail adhesives, typically used in nail applications, is around 2 hours. Option D is the answer.
Step-by-step explanation:
Nail adhesives are designed to bond artificial nails to natural nails or overlays and require adequate time to cure properly. The thicker the adhesive layer, the longer it generally takes to dry and set.
Options 1, 2, and 3 represent shorter timeframes, which might be applicable for thinner layers of adhesive or different types of nail products. However, for the thickest nail adhesives, a longer drying time of approximately 2 hours is common to ensure a strong and durable bond between the artificial and natural nails.
Option D is the answer.