"I know that this may seem trivial. . ."
Its not trivial if you don't know and want our help.
A batter-runner going to 1B forces the runner on 1B to go to 2B, which forces that runner to 3B, which forces that runner to home. By definition, if the base is tagged before a runner being forced to that base reaches it, the runner is out. So, with bases loaded, you have four bases that the out play can be made by tagging the base.
Hope this helps.
WMB
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