Explanation: When a vacuum tube in an RF stage burns out, the signal path is interrupted, and the stage no longer functions. Both options A and B provide temporary workarounds to restore some receiver functionality. A) Connecting a small capacitor (e.g., 0.001 µF) between the control grid and plate connections of the removed tube's socket effectively bypasses the defunct stage. The capacitor provides a low-impedance path for the RF signal, allowing it to pass from the input of that stage to its output, albeit without amplification. This maintains the signal flow through the receiver chain. B) Connecting the antenna directly to the control grid of the *next* functional RF stage (or even the mixer/converter) completely skips the burned-out stage. While this bypasses any pre-amplification and filtering provided by the failed stage, strong signals can still reach the rest of the receiver circuitry, allowing for some reception. Since both methods are viable temporary repairs, "Either A or B" (C) is the correct answer. Both aim to re-establish a signal path through the receiver, prioritizing functionality over optimal performance.