ANSWER
D. 100.0
Step-by-step explanation
The equivalence resistance of a circuit with resistors connected in series is the sum of the resistances of each resistor. In this case, we have two resistors with a resistance of 50.0 Ohm, so the equivalent resistance is,
![R_(eq)=50.0+50.0=100.0](https://img.qammunity.org/2023/formulas/physics/college/a9ffcw5k7jbwcw8086guvrb6sckshqlaxk.png)
Hence, the equivalent resistance is 100.0 Ohm.