Adoption of electric vehicles is often presented as a straightforward way to reduce transportation emissions. The actual emissions benefit, however, hinges on the source of the electricity used to charge them. In regions where the grid still depends heavily on coal-fired generation, the per-mile emissions of an electric vehicle can come close to those of a comparable gasoline vehicle.
Which choice best describes the function of the second sentence in the text?
- Acheck_circle
It identifies the condition on which the first sentence's promise depends.
- B
It introduces an unrelated transportation technology.
- C
It supports the straightforward picture introduced in the first sentence.
- D
It defines the term 'emissions'.
Explanation
The second sentence specifies that the benefit hinges on grid composition. B captures this conditional move.