Everything you want displayed on-screen has to go through the video amplifier or it won't get displayed, thus Answer C. is the right answer.
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A VRM - Variable Range Marker allows the RADAR operator to vary the range of the Variable Range Market to place it over the desired target and read-off the distance on the RADAR display.
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Variable resistors, a.k.a. potentiometers, are the most-used means for an operator to control an electrical circuit, thus Answer A. is the right answer.
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The VRM - Variable Range Marker measures distance to an object. A shift register is required as part of the electrical circuit measuring the distance on the display, thus Answer D. is the right answer.
Answer A. is wrong because the Resolver generates a signal with the heading the RADAR antenna is pointing at relative to the ship and is thus unrelated to the question being asked.
Answer B. is wrong because because interference rejection is unrelated to the question being asked.
Answer C is wrong because STC - Sensitivity Time Control is unrelated to the question being asked.
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Answer B. clearly states the function of the VRM so it's the right answer.
The VRM relies on its own oscillator so Answers A. and D. can't be right.
The VRM is calibrated by moving it to the nearest and to the farthest range markers without any need for a frequency counter, so Answer C. can't be right.
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