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" It was Heath Ledger's obsession with the character he played in the Dark Knight, coupled with his commitment to preparing for the role, that led to his death."

A - Heath Ledger was so commited to his act in the Dark Knight that he soon developed an obsession with the character, which ended up with his death.

B- Heath Ledger's death was caused both by his dedication to preparing for his role in The Dark Knight and by his obsession with the character.

I said A