Explanation
In this vocabulary item, Odd is the closest synonym of Eccentric, so option C is correct. The word Eccentric and the word Odd share the same central sense in the context tested by the question, although usage, tone and grammatical form should still be checked before substituting one for the other. A synonym is not required to be identical in every possible sentence; it must preserve the intended meaning in the relevant context. Here, replacing Eccentric with Odd keeps the core idea intact without reversing the tone or changing the action, quality or state expressed by the target word. The alternatives Lean, Accumulate and Communicate do not express the same central meaning as Eccentric. This distinction matters because competitive examinations often place one accurate synonym beside three familiar but contextually unsuitable words. To verify Eccentric independently, identify its part of speech, state a short definition, and place both Eccentric and Odd in the same simple sentence. If the sentence retains its essential meaning and grammatical structure, the synonym relationship is supported. Learners should revise Eccentric together with Odd, a brief usage cue and the contrasting distractors.