Answer and explanation

Correct answer: D. an

  1. Step 1: Use "an" before a vowel sound, "a" before a consonant sound, "the" for something specific or unique, and no article for general uncountable or plural ideas.
  2. Step 2: Here the correct choice is "an".
Answer
an.
Why not the others: a, the and (no article) do not fit here.

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