Answer: Research about aptitude testing
Step-by-step explanation:
According to the given question, the research about the aptitude testing is one of the research based activity that the children are required to qualify under the category 2 and it include the various types of observation, surveys and the education based tests.
The aptitude testing is one the process that is used for screening the potential, ability and the skills of the people under the category 2. The importance of the research about the aptitude testing process is that it helps in evaluating the both strength as well as weakness of the person.
Therefore, Option (A) is correct answer.