Final answer:
The correct word to complete the sentence is 'por', which is used to indicate the means or method of an action.
Step-by-step explanation:
The correct word to complete the sentence is 'por'.
'Por' is used to indicate the means or method by which an action is done, which aligns with the context of the sentence 'Lo hizo medio del Internet' (He did it through the Internet).
For example, 'Llamé por teléfono' (I called by phone) or 'Viajé por avión' (I traveled by plane) are other instances where 'por' is used to indicate the means or method of an action.
Learn more about Spanish grammar