Bonjour Claus !
In French, le, la, l' (it) and les (them) are used to replace objects.
The choice between le and la is depending on the gender of the prementioned object.
In this case, you were not given any clue as to what the object gender was (what was sent), therefore both "Bernard la lui envoie (e.g. la lettre)" or "Bernard le lui envoie (e.g. le colis) were possible answers.
We could have offered either, but we went with la.
I hope that's helpful.À bientôt !
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