The cells went through 6 generations, which is represented by option B.
Because the experiment began with 4 cells, we can label that as generation 1. From that point, we multiply 4 by 2 until we get to the generation of 128 cells.
Generation 2: 4 • 2 = 8 cells
Generation 3: 8 • 2 = 16 cells
Generation 4: 16 • 2 = 32 cells
Generation 5: 32 • 2 = 64 cells
Generation 6: 64 • 2 = 128 cells
Therefore, it took 6 generations for the experiment to reach 128 cells in the end.
