Discussion
Assertion: the Wagner earth is adjusted alternately with the bridge arms. Reason: earthing the bridge at one corner would short out one of its arms.
Answer: A
The alternate adjustment is needed because the two nulls interact, not because a corner earth would short an arm. Earthing one corner is in fact perfectly possible; it simply leaves the stray capacitances of the other corners in parallel with the arms, which is what the Wagner branch is designed to avoid.
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