B. Scientists are alarmed that climate change may cause the extinction of coffee plants
Explanation:
According to the given passage, it is narrated that there is a general alarm among scientists about the effect of climatic change on the environment and how it would affect coffee.
It is stated that coffee are at danger of becoming extinct as a great number of plants that are used in the production of coffee are at risk because of their specific weather needs. The scientists believe this is a genuine risk and want the lawmakers and everyone else to put more effort to put countermeasures in place to checkmate this.
Therefore, the main idea of the passage is that scientists are alarmed that climate change may cause the extinction of coffee plants
I would say this group of lines illustrates the music of autumn, because the word choir is mentioned: <span>"Then in a wailful choir the small gnats mourn Among the river sallows, borne aloft Or sinking as the light wind lives or dies".</span>
