Which of the following best describes the steps of figuring out the casualty of earthquake

Which of the following best describes the steps of figuring out the casualty of earthquakes？

A．Registering the earthquake→calculating the details of the earthquake→predicting the loss of life and money.

B．Gathering information about the building→calculating the details of the earthquake→predicting the loss of life and money.

C．Calculating the details of the earthquake→gathering information about the building→predicting the loss of life and money.

D．Reporting the earthquake→gathering the information→predicting the loss of life and money.

请帮忙给出正确答案和分析，谢谢！