Choose the phrase that best completes the sentence.
They didn’t discover that the picture had been stolen until they came back home.
A.Until they came back home that they discovered that the picture had been stolen.
B.It is not until they came back home that they discovered that the picture had been stolen.
C.Not until they came back home had the picture been stolen.
D.Only after they came back home did they discover that the picture had been stolen.