Spot the Internal Validity Threat that is MOST likely at work for each of the following scenarios

Question 9 0.5 pts High work productivity is an important characteristic that HR needs to consider when hiring employees. Every current employee had taken a work productivity task in their initial interview. Using their task scores in interview as a reference, researchers decided to assign employees who gained relatively low task scores into plant-present group to boost their work productivity. Then the experiment proceeded as normal. The researchers found that those in the plant-present group did better in their post work productivity test compared to those in the plant-absent condition. Selection No Threat Instrumentation Mortality Interactions History O Maturation Testing Diffusion Regression to the mean