Final answer:
Job classification and net pay are not determinants of federal withholding taxes; these are based on marital status and the number of dependents claimed.
Step-by-step explanation:
The determinants of federal withholding taxes do not include job classification (B) and net pay (C). When calculating federal withholding taxes, the amount to be withheld is primarily influenced by marital status (A) and the number of dependents (D) claimed by the employee. Job classification does not directly affect federal withholding tax calculations, and while net pay signifies the total amount one receives after deductions, the withholding is based on gross income rather than net pay.