From UBC Wiki

explains a belief or action without providing justification.


Cesar: In the case of a murder, a merely explanatory reason for the murder's actions would be that neurons in their brain fired, causing their finger to pull the trigger of a gun, thus murdering their victim.

In the problem of other minds, the fact that we begin to attribute minds to others very early in childhood (it seems we are 'hard wired' to attribute agency to lots of things) might be considered a merely explanatory reason for why we believe that others have minds.