Answer:
The memorable day of my life would be the day when I came to know I was the second to score the highest in commerce in my town. I could not believe my ears as I never dreamed of such achievements. It was the memorable day of my life because I was able to see the happiness in my mother's eyes. I thought she would cry.
Explanation:
For once in your life, try something new and exciting.
The subject of the above sewntence is A. an understood you.
The sentence talks about you and the speaker is talking to you.
The above sentence is a compound sentence. It has an independent clause and a dependent clause.
The independent clause is (You) try something new and exciting.
The dependent clause is For once in you life. It starts with a coordination conjunction and it cannot stand on its own.
Answer:
I hope C is the best one .....
I believe that the answer to your question would be A and B. I hope this is helpful.