For Which of the Following Studies Would an After-Only Experimental

For which of the following studies would an after-only experimental research design be most appropriate?

A) The effect of cause of spousal death on widow self-esteem.
B) The effect of preoperative teaching on vascular complications after surgery.
C) The effect of a mentorship program on improvement of student performance in a BSN program.
D) The effectiveness of using the videotape to teach adolescent males about the warning signs of testicular cancer.

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