An After-Only Nonequivalent Control Group Design Would Be Appropriate to Study

An after-only nonequivalent control group design would be appropriate to study which of these research questions?

A) What is the effect of the cause of spousal death on widows' self-esteem?
B) What is the effect of preoperative teaching on vascular complications after orthopedic surgery?
C) What is the effect of a mentorship program on improvement of students' clinical performance in a baccalaureate nursing program?
D) What is the effect of a videotaped teaching method on knowledge of adolescent males about the warning signs of testicular cancer?

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