The sentence is: he loves his Mum. How the hell is "aime" right and "aime beaucoup" wrong, especially given the inanity of "aime bien" meaning not "LOVE" but "LIKE"?
Follow the link to a previous answer on this very topic: aime-and-aime-beaucoup
I hope this is helpful.
Bonne journée !
As is covered in the lesson, « aimer » can mean either to like, or to love (especially, but not exclusively for a person) depending on context.
By using « aimer beaucoup » or « aimer bien », you are defining the meaning of « aimer » to be 'to like', with beaucoup defining a stronger liking "a lot", whereas bien indicates a weaker level of liking, something similar to 'like well enough' in English.
It is not 'inane', just different to (or should that be 'from') English.
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