In the Pretest-Posttest Control Group Design Shown Above,selection Bias Is

$$\begin{array} { l l l l } \text { EG: } \mathrm { R } & \mathrm { O } _ { 1 } & \mathrm { X } & \mathrm { O } _ { 2 } \\\text { CG: } \mathrm { R } & \mathrm { O } _ { 3 } & & \mathrm { O } _ { 4 }\end{array}$$
In the pretest-posttest control group design shown above,selection bias is eliminated by ________.

A) statistical control
B) randomization
C) matching
D) design control

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