What would be a good revision of this stringy sentence?

Darwin went to the prom but he forgot the flowers so he went back home to get them.
A) Darwin went to the prom and forgot the flowers but went back home to get them.
B) Darwin went to the prom so he forgot the flowers. He went back home to get them.
C) The prom was where Darwin went. He forgot the flowers. He went back home to get them.
D) Darwin went to the prom. Because he forgot the flowers, he went back home to get them.