implication VS conjunction

Question

When should we use implication and when conjunction? For example in this question:

https://gateoverflow.in/989/gate2006-26?show=188041#c188041

What is the difference in options B and D? 

    

Answer 1

 Tigers and lions attack if they are hungry or threatened.

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Suppose a condition where tiger or lion is neither hungry nor threatened which implies it does not attack => This condition is satisfied and follows the above statement.i.e its TRUE and possible

Here hungry(x)=false

threatened(x)=false

and attacks(x)=false

Option B) = ∀x[(tiger(x) ∨ lion(x)) → {(hungry(x) ∨ threatened(x)) ∧ attacks(x)}]

Complete statement return false i.e its not possible which contradicts with original statment.

Option D) = ∀x[(tiger(x) ∨ lion(x)) → {(hungry(x) ∨ threatened(x)) → attacks(x)}]

 Here its true  which support the given statement

Comments

Got it thanks.