Answer :
The Soviets responded to the East Berliner's decision to defect to the west in large numbers by building the Berlin Wall, separating east Berlin and west Berlin.
The construction of the Berlin Wall that separated the East Berlin and West Berlin was the action made by Soviet in response to high number of East Berliners defection to the West.
What is the Berlin Wall?
It is was a concrete barrier divided the Berlin and separating the West Berlin from the Easter Berlin.
Hence, the construction of this structure by soviet was in response to high number of East Berliners defection to the West.
Therefore, the Option A is correct.
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