Read the following sentence:
Everywhere you look, people are commuting in gas- guzzling SUVs. Meanwhile, their backseats are empty - all six of them.

What would most naturally come next in this argument?
A. a call to action to improve roads and the highway system
B. the writer's personal observations about drivers' bad habits
C. a proposal that drivers should start carpooling more often
D. The definition of a "gas guzzler" in terms of miles per gallon