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if it rains(A) i take my umbrella(B).
if i take my umbrella(B) i will wear my hat(C).
if i wear my hat(C) i will go and drink a coffee(D).
(A) If D, then A. => i drink coffee when it rains as well when the sun shines and for many other reasons => wrong
(B) If not B, then not C. => when i don`t take my umbrella i will wear my hat anyway => wrong
(C) If not D, then not A. => A is a condition for B; B is a condition for C; C is a condition for D. i don`t drink a coffee, so the preceeding conditions did not happen. => right
(D) If D, then E. => nothing about E => wrong
(E) If not A, then not D. => i drink my coffee anyway. maybe it rains, mabye it isn`t raining. => wrong
If your mind can conceive it and your heart can believe it, have faith that you can achieve it.
(A) is out. We only know If A->B->C->D. So If A then D, not the other way roudn
(B) is out. We only know if !C, then !B.
(C) is the anwer. !D->!C->!B->!A so If !D then !A
(D) Can't link D to E
(E) From the logic in C, we know !A cannot be logically linked with !D