Answer:
The correct answer is - temporal validity.
Step-by-step explanation:
Temporal validity is an external validity that exhibits that the result of the research is valid in relation to the time which means the findings that are successfully made by the research have some of the variables no longer relevant after a time or to the future.
Changes in a result of preference at the beginning and after announcing the grades show that variables change over time and it is an example of temporal validity.