Explanation: The accuracy, frequency response, and stability of an oscilloscope are fundamentally limited by its internal electronic components. 1. **Sweep oscillator quality:** The sweep oscillator generates the horizontal voltage ramp that moves the electron beam across the screen at a constant rate. A high-quality sweep oscillator ensures a linear sweep, which is crucial for accurate time measurements. Poor quality can lead to non-linear sweeps, jitter, or drift, affecting timing accuracy and display stability. 2. **Deflection amplifier bandwidth:** The vertical deflection amplifiers boost the input signal to drive the vertical deflection plates. The bandwidth of these amplifiers determines the maximum frequency the oscilloscope can accurately display without significant attenuation or distortion. A limited bandwidth means higher frequency signals will appear smaller or distorted, directly impacting the frequency response and accuracy. The other options refer to less critical factors or misinterpret technical terms. For example, "tube face voltage/frequency increments" are not standard technical limitations, and while deflection amplifier voltage range is important, its *bandwidth* is the primary limit for frequency response.