1.About two weeks into the study, a new TV program started airing in town. The program targeted kindergartners, using entertaining puppets to teach kids concepts like reading, science, math, history, and physical education. Most of the kids involved in the study fell in love with the TV show and started watching it every day. The researchers found that students in the math-based reading program and the control reading programs performed similarly on the PICO post-test at the end of the study. Which internal validity threat is most likely occurring in this scenario?

a.Maturation

b.Regression to the mean

c.Selection

d.Mortality

e.Instrumentation

f.Testing

g.History

h.Interactions

i.Diffusion

j)No Threat