Karen Is Teaching Knitting as a Means to Increase Fine

Multiple Choice

Karen is teaching knitting as a means to increase fine motor skills in her occupational therapy sessions. Cynthia is a qualitative researcher who has enrolled in the class as a student to experience the new 'therapy'. Cynthia feels that Jacob, a student in the class, will not benefit from the training since he is a large male she feels that knitting is better for females with smaller hands. In fact, in her field notes Cynthia finds support that indeed, the knitting therapy does not seem to be a positive experience for Jacob.
-Given this scenario, Cynthia may have introduced which of the following validity threats into her study?

A) Observer bias
B) Observer effect
C) Selection effect
D) Selection bias