Which prefix can be added to the base word 'RESPONSIBLE' to form its exact opposite meaning?

Answer and explanation

Correct answer: B. Ir-

  1. Step 1: Adjectives beginning with the letter 'r' typically take the negative assimilation prefix 'ir-'. Step 2. Attaching 'ir-' to 'responsible' produces 'irresponsible'. Answer: Ir-. Why not the others: 'Unresponsible', 'disresponsible', and 'imresponsible' are non-existent in English morphology.

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