Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
Jack has won a jackpot prize. 10% of it was donated to flooded areas.
A. Jack has won a jackpot prize, 10% which half was donated to flooded areas
B. Jack has won a jackpot prize, 10% of which was donated to flooded areas
C. Jack has won a jackpot prize, 10% of that was donated to flooded areas
D. Jack has won a jackpot prize, which was donated to flooded areas
