The provided question does not include the question related to the statement and options, however the question is as follows:
Which internal validity threat is suspected?
A. History
B. Maturation
C. Testing
D. Mortality
E. Selection bias
Answer:
The correct answer is - D. mortality.
Step-by-step explanation:
Aspects or influences other than independent variables that might be helpful to analyze and describe the result of a study considered as the Threats to the internal validity.
Mortality is most likely to be the threat to internal validity as Experimental mortality is significant threat to internal validity in the case of the longer time since the dropouts increases.
Thus, the correct answer is - D. mortality.