∀x [ ( Tiger(x) ∨ Lion(x) ) ∧ (Hungry(x) ∨ Threatened(x)) --> Attack(x) ]
We can represent also in this way,bcoz of
Exportation law : (P-->(Q-->R)) ≡ ((P ∧ Q) -->R)
So, D is correct ans.
(D) ∀x[(tiger(x) ∨ lion(x)) → {(hungry(x) ∨ threatened(x)) → attacks(x)}]