Logical reasoning at Klarna interview

You are correct 'B' is the answer 1). Center 3 Dots , that is the 3rd column Will stay the same 2). 4th and 5th Column moves from right to left one at a time, as soon 2 black dots merged it will be come white, if the black moves it will become white again 3). Try the entire sequence filled with Numbers ( 1 to 10 ) in place of black dots to avoid confusion and solve the problem

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The correct Answer is B

Its because the middle column black squares remain constant while the two right columns move left. When they merge they become white. At separation restore to black.