Voltage Division in Series Circuit Steps:

• Total voltage is 6V across two series resistors; potential difference of 1V is across one resistor (assume fixed resistor, but value unspecified).
• Use voltage divider rule: V_across = V_total * (R_specific / (R_fixed + R_variable)).
• Set up equation for 1V across the specified resistor, but fixed resistor value and which one has 1V are missing.
• Solve for R, but insufficient data prevents numerical solution. Not enough information to determine R or select option C.

Final answer: Not enough information.