单项选择题

Questions 14 to 16 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.
According to the speaker, how was most corn prepared

A.It was first boiled and then dried.
B.It was braided in bundles and steamed.
C.it was dried and then ground into flour.
D.It was roasted and wrapped in husks.