Benevento lost their last league game with 5-2, thereby blowing their morale.
On the other hand, Napoli are currently the 4th team in the league with 3 wins and 1 loss. Besides, they won their last league game with 4-1 against Atalanta.
The AH line is away team (-1.50), which is in favor of the stronger Napoli.
Therefore the visitors are expected to win this game.