The correct answer is: C. 25% of the top panel wind load to bottom bracing.
Sway bracing is a type of structural bracing that is used to prevent the lateral movement of a structure. It is typically made of steel or wood and is installed in a diagonal pattern. Sway bracing is designed to transfer a portion of the top panel wind load to the bottom bracing. This helps to prevent the structure from swaying and collapsing in high winds.
The amount of load that is transferred by the sway bracing depends on the height and width of the structure, as well as the wind speed. In general, sway bracing is designed to transfer 25% of the top panel wind load to the bottom bracing. This is a conservative design value that ensures that the structure will be able to withstand even the most severe winds.
The other options are incorrect because they do not represent the amount of load that is typically transferred by sway bracing. Option A (20%) is too low, while Option B (10%) and Option D (50%) are too high.