The correct answer is: A. Not fall below 1 V
For faithful amplification by a transistor circuit, the value of VCE should not fall below 1 V for silicon transistor. This is because the transistor will not be able to amplify the signal properly if the VCE is too low. The VCE is the voltage drop across the collector and emitter terminals of the transistor. It is important to keep the VCE above a certain minimum value in order to ensure that the transistor is operating in the correct region. If the VCE is too low, the transistor will enter into saturation, which will cause the amplification to be reduced.
Option B is incorrect because the VCE cannot be zero. If the VCE is zero, there will be no voltage drop across the collector and emitter terminals of the transistor. This will cause the transistor to not operate properly.
Option C is incorrect because the VCE should not be 0.2 V. The VCE should be at least 1 V in order to ensure that the transistor is operating in the correct region.
Option D is incorrect because the VCE should not fall below 1 V.