Choose the correct option to change the following assertive sentence into an exclamatory sentence:

It is a matter of great happiness that we have won the trophy.

Hurrah! we have won the trophy.

The correct answer is Option (1) → Hurrah! we have won the trophy.

• To convert an assertive sentence into an exclamatory sentence, we use an exclamatory word (Hurrah!, Alas!, Oh!, What!, How! etc.).
• "Hurrah!" is used to express joy or happiness, which fits the context of winning the trophy.

Thus, the correct sentence is: "Hurrah! We have won the trophy."

OTHER OPTIONS

• "Alas! we have won the trophy."  → "Alas!" is used to express sorrow or disappointment, which is incorrect for this joyful situation.
• "Hurrah! we won the trophy!"  → Incorrect because it changes the tense ("won" instead of "have won").
• "Hay! we had won the trophy!"  → "Hay" is not an appropriate exclamation, and "had won" (past perfect) is incorrect.