The correct answer is B: To feed high-impedance antennas from a low-impedance source. A Wilkinson divider is used to feed high-impedance antennas from a low-impedance source (or to split/combine signals while maintaining isolation). It's a power divider/combiner that provides impedance transformation and isolation. A Wilkinson divider splits one input into multiple outputs (or combines multiple inputs) while maintaining good isolation between outputs and providing impedance matching. It can transform impedances - for example, feeding a high-impedance antenna array from a low-impedance source. The Wilkinson divider uses quarter-wave transformers and resistors to achieve this. It's commonly used in antenna arrays, power amplifiers, and RF systems where you need to split or combine power while maintaining impedance matching and isolation.