Read the following sentence and then select the sentence that would best clarify its meaning:
Roberto took the train with his brother to meet up with his friend.
A. Roberto took the train to meet up with Roberto's friend, and Roberto's brother came along.
B. Roberto wanted to meet up with his friend, so he and his brother took the train.
C. Roberto wanted to meet up with his friend, so he brought Roberto's brother on the train ride.
D. Roberto took the train to meet Roberto's friend with his brother.