Directions: Read the sentence below to find out if there is any grammatical error in it. The error, if any, will be in one part of the sentence. Select the part with the error as your answer. If there is no error, select 'No Error'.

It has a remarkable transformation of several decades (A) / before the small coastal settlement evolved into (B) / a thriving metropolis, attracting investors (C) / and innovators from all over the world (D) / No Error (E) .

The correct option is A.

Explanation:
Part (A) contains the grammatical error in the sentence.

1. Tense Mismatch: The sentence describes events that occurred in the past before the coastal settlement "evolved" (past tense, in part B) into a metropolis. Therefore, using the present tense "has" in part (A) is incorrect and creates a tense inconsistency.

2. Incorrect Phrasing: The structure "It has a remarkable transformation of several decades" is ungrammatical. To indicate a process spanning time prior to an outcome, appropriate phrasing such as "It took several decades of remarkable transformation" or "It was a remarkable transformation over several decades" should be used instead.

Correct Sentence:
"It took several decades of remarkable transformation before the small coastal settlement evolved into a thriving metropolis, attracting investors and innovators from all over the world."