Answer :
The Unfactored Compressive unit stress, Fc, corresponds with the slenderness ratio but cannot be conclusively identified without the specific table or additional context, such as Table 10.1a that is referenced in the question.
Option A is the correct answer
If the slenderness ratio is calculated to be 56.3, the corresponding Unfactored Compressive unit stress, Fc, can usually be determined by using a specific table from a textbook or design code, such as Table 10.1a as mentioned in the question. However, as the table details are not provided in the question, nor available in this context, it is not possible to accurately determine the unfactored compressive unit stress without the specific table or additional information.
Generally, the compressive strength values are influenced by the material properties, dimensions of the member, and the applied loading conditions. These tables are used by engineers and architects to ensure that structural components meet safety requirements and standards for building construction.
Option A is the correct answer