An idiom is used in three sentences. You need to choose the right option that covers the correct usage amongst these three sentences. The best thing since sliced bread
A.            Microwave oven is the best thing since sliced bread. I use it every day.
B.            I feel mobile phones are the best thing since sliced bread. Life is so easy after that!
C.            My success after 4 attempts is the best thing since sliced bread as I worked very hard for it!