Final answer:
The correct screw choice is 1-1/4 inch Type S bugle head.
Step-by-step explanation:
The correct choice for connecting 3/4 inch single-layer panels to steel studs would be option C. 1-1/4 inch Type S bugle head.
The length of the screw needs to be longer than the thickness of the panel and must provide enough holding power in the steel studs. A 1-1/4 inch screw is ideal for this purpose.
By using a screw with a bugle head, the screw is less likely to strip or damage the panel as it is being inserted. This helps to ensure a secure connection between the panel and the steel stud.