Identify the underlined portion that contains a grammatical error:

The persistent degradation (A) of coastal mangrove forests along the western seaboard (B) have accelerated (C) catastrophic shoreline erosion and salt-water intrusion (D).

Answer and explanation

Correct answer: B. (C) have accelerated

Answer: (C) have accelerated. Why not the others: (A) 'persistent degradation' is a correct noun phrase; (B) 'along the western seaboard' is a standard locative prepositional modifier; (D) 'salt-water intrusion' is an accurate nominal complement.
  1. Step 1: Locate the grammatical subject of the clause: the head noun is the singular abstract noun 'degradation' in part (A). The phrases 'of coastal mangrove forests' and 'along the western seaboard' are intervening prepositional adjuncts.
  2. Step 2: The singular subject 'degradation' requires the singular present perfect auxiliary 'has accelerated', making (C) 'have accelerated' grammatically incorrect.

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