Answer and explanation

Correct answer: A. Heterogeneous

  1. Step 1: 'Homogeneous' means of the same kind or consisting of parts that are all similar.
  2. Step 2: 'Heterogeneous' is its direct antonym, denoting a composition of diverse, dissimilar ingredients or constituents.
Answer
Heterogeneous.
Why not the others: 'Monolithic' describes a massive, uniform, indivisible structure; 'Uniform' is a close synonym of homogeneous; 'Congruent' means in agreement, correspondence, or harmony.

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