Directions 151 - 155 : In these questions, some parts of the sentences have errors and some are correct. Find out which part of a sentence has an error and blacken the oval (*) corresponding to the appropriate letter (A, B, C). If a sentence is free from error, blacken the oval corresponding to (D) in the Answer Sheet.
The ruins of the spillway are a vital clue / (A) to the epic struggle that unfold as generations of khmer engineers/ (B) coped with a water system that grew complex and unruly/ (C) No error (D).

A) A
B) B

C) C
D) D

Correct answer:
B) B

Description for Correct answer:
Since it tells about past, the word in part (B) unfold should be changed as unfolded.

Please provide the error details in above question

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