Convert the following assertive sentence to exclamatory Sentence:

It was a really good day.

What a good day it was!

The correct answer is Option (3) - What a good day it was!

To convert an assertive sentence to an exclamatory sentence, we typically use expressions like "What a" or "How" followed by the subject and verb.

• "It was a really good day."
  • Becomes → "What a good day it was!" (Correct exclamatory form)

Other options are incorrect because:

• "Oh! What a good day!" (Incomplete sentence)
• "Alas! What a good day!" ("Alas" is used for expressing sorrow, which is inappropriate here.)
• "Oh yes! Good day!" (Does not maintain the sentence structure or meaning.)