【单选题】

{{I}}{{B}}Questions 14 to 17 are based on the following passage.At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage.{{/I}}{{/B}} What will be the possible threat to plants in the future

A、Storms and floods.
B．Disease and fire.
C．Less space for their growth.
D．Rapid increase of the animal population.