Em qual das seguintes frases o adjetivo "difficult" está no grau superlativo?
(A) -
this math problem is difficult to solve.
(B) -
this is the most difficult math problem i've ever solved.
(C) -
this math problem is more difficult than the other one.
(D) -
my math teacher said this problem was very difficult.
(E) -
solving this math problem was one of the most difficult things i've done.
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