Choose the grammatically correct sentence:

The correct answer is Option (2) → So crowded was the railway platform that Mira could not find her uncle for half an hour.

“So + adjective” at the start of a sentence:

• When a sentence starts with “So” + an adjective, the verb “was” comes before the subject.
• Here the order is So crowded was the railway platform. The result then comes after that.

Why the Other Options are Incorrect?

Option 1: So crowded the railway platform was that Mira could not find her uncle for half an hour. — Incorrect. After “So crowded” at the start, “was” must come before the subject “the railway platform”.

Option 3: So crowded was the railway platform as Mira could not find her uncle for half an hour. — Incorrect. The result after “So ... was ...” is joined with “that”, not “as”.

Option 4: So was the railway platform crowded that Mira could not find her uncle for half an hour. — Incorrect. The adjective must stay right after “So”. “So was the railway platform crowded” moves it away.