单项选择题

In this section, you will hear five short conversations. Each conversation will be read only once. At the end of each conversation, there will be a twenty-second pause. During the pause, read the question and the four choices marked A, B, C and D, and decide which is the best answer. Then mark the corresponding letter on the answer sheet with a single line through the centre.
Who is the woman most probably speaking to

A. A postal clerk.
B. A railway porter.
C. A taxi driver.
D. A salesman.