Answer and explanation

Correct answer: C. A subject or issue over which there is continuing disagreement

  1. Step 1: 'A bone of contention' refers to a dispute or unresolved problem over which two parties argue. Step 2. It metaphorically echoes dogs fighting over a single bone. Answer: A subject or issue over which there is continuing disagreement. Why not the others: It does not refer to literal pieces of dinner meat, physical bone fractures, or friendly consensus.

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