Through which of the following methods of research is a 'cause and effect relationship' focused?

The experimental method is the approach that focuses squarely on a cause and effect relationship.

By manipulating a cause and controlling other factors it isolates the effect produced.

The historical method reconstructs and interprets past events, not controlled causation.

The ex post facto method observes an effect and looks back for a cause it cannot manipulate.

The case study method describes one unit in depth without establishing controlled causation.

Only the experiment allows an active manipulation of the presumed cause under controlled conditions.