Transportation problems can be solved by the simplex method

Which of the following is the best example of a whistleblower?

A. Barbara told her friend that her employer was illegally dumping toxic waste into the river. B. Susan told her neighbor that her employer was illegally dumping toxic waste into the river. C. Gayle told a county environmental compliance officer that her employer was illegally dumping toxic waste into the river. D. Annie told her business law professor that her employer was illegally dumping toxic waste into the river.

In the pretest-posttest control group design shown above, selection bias is eliminated by ________

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