Over the course of the twentieth century, humans have become increasingly more vulnerable to the disruption of commerce caused by volcanic eruptions.
Which change has ,begin emphasis,most,end emphasis, increased the vulnerability of commerce to volcanic eruptions?
Answer options with 4 options
A.
The frequency and intensity of volcanic eruptions have increased.
B.
The pollutants released by volcanic eruptions have become more toxic.
C.
The overall amount of commerce conducted by air transportation has increased.
D.
The overall amount of commerce conducted by ground transportation has increased.