<u>Sequential research design</u> would allow them to measure changes with age and within individuals <u>over time, even though it would be expensive, limited to one cohort, take a long time, and might have people to drop out of the study.</u>
<h3><u /></h3><h3><u>What is a research design that is sequential?</u></h3>
Sequential research is carried out in a planned, staged manner, or "serially," with the intention that each stage would build on the one before it until enough information is acquired over a sufficient period of time to verify your theory.
The sample size in sequential research is not fixed in advance. The researcher can either accept the null hypothesis, reject it, or accept the alternative hypothesis after examining each sample, or they can select a different group of participants and do the study again. This implies that before choosing which hypothesis to adopt, she/he can collect an illimitable number of subjects.
Learn more about sequential research design with the help of the given link:
brainly.com/question/16951946?referrer=searchResults
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America has a class system. 
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Answer:
b. clients have better treatment outcomes
Explanation:
An ethnic match between the therapist and the client and when ethnic-specific services are carried out have been proven by researchers to have better outcomes on clients. 
It was discovered that the outcome from ethnic-specific services (ESS) had better outcomes than when mainstream services are carried out. It resulted to a significance in the relationship between cost-utilization and outcome for ESS for patients. An effective and efficient mental health treatment is likely to be achieved when ethnic-specific services are adopted.