Explanation: Transmission lines carry radio frequency (RF) energy. If a transmission line lacks proper shielding, RF energy can "leak" out, effectively radiating like an unintended antenna. Similarly, improper termination (a mismatch between the line and the antenna) causes reflected power and standing waves, which can increase RF leakage. This radiated RF acts as unwanted signals, causing Radio Frequency Interference (RFI) to nearby electronic devices, most notably sensitive communications receivers. Overmodulation (C) is a transmitter issue related to the audio input, not the transmission line. While severe RF fields could potentially damage components, silicon crystals (A) are not part of the transmission line itself, and interference is the more direct and common result. Finally, improper shielding and termination actually *increase* RF loss due to radiation and reflection, so minimal RF loss (D) is incorrect; rather, it results in *increased* loss.