Which of the following statements is true？A．Firestone didn" t speak out the proposal.B．Fir

Which of the following statements is true？

A．Firestone didn" t speak out the proposal.

B．Firestone planned the proposal by himself.

C．Natalie had expected the proposal on their trip.

D．Firestone"s proposal was inexpensive.

请帮忙给出正确答案和分析，谢谢！