You will hear five persons talking about different things. Decide the subject of their talk by the speaker. Write one letter(

It showed a population of 1，008，175，288，or one-quarter of the human race．There was a nineteen-point questionnaire to complete，and with the help of twenty-nine computers the information was broken into categories such as age，occupation and marital status．

In your country, is there one chief mode of transport or do two exist side by side on an equal basis? For example, in some countries rail and highway work together, in others rail and canal barges work together, etc.