Respuesta :
option D is correct .
A scientific theory can be defined as :- an explanation of a feature in the natural worlds that can be repeatedly tested. This can be verified in accordance with scientific method by using different accepted protocols of observation , measurement and result evaluation.
The correct aswer is D.~Supported by a substantial body of evidence observed in nature
An educated guess would be a hypothesis- the starting point of all scientific theories that needs to be tested (hasn't been proven yet). If enough evidence accumulates to support a hypothesis it becomes accepted as a valid explanation of a phenomenon.