Aresearcher concludes that frustrating people by giving them a task that is impossible to complete causes them to behave more aggressively. only warrants this type of conclusion.

The correct answer is: Experimental research  

Explanation:

Experimental research is a technique or an experimental procedure research which is performed or conducted to validate or support a hypothesis. In this scientific approach, a particular set of variables are observed and measured by keeping other set of variables constant, as a subject of the research or the experiment.

answer; ecological fallacy;

they could have terrible tropical storms which will destroy the crops in the colonies