A is the way to go! Nothing beats a good ol' exclusion activity to get the job done. Plus, it sounds like a great opportunity to show off my query skills.
C) Use a query activity to obtain the target population and send to a split activity to remove each age group with record count limitation set as random.
A) Use a query activity to query the target population and another query activity to obtain the desired control group. Then use an exclusion activity to get the exclusive target.
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