(1) Just like laptops and other technologies, cars have recently been developed that can be plugged into electrical outlets to charge them. (2) They are called "plug-in hybrids," and most of their power comes from electricity. (3) If enough people use them, these plug-in vehicles could drastically reduce our gas consumption. (4) In addition, the gasoline that cars currently use is derived from crude oil, which has gotten to be very expensive. (5) Much of our oil also comes from countries overseas. (6) These electric cars could help us to be less dependent on other nations for our energy.
1
Which sentence could best be added after sentence 6?

(6) These electric cars could help us to be less dependent on other nations for our energy.
A.
Traditional, gasoline-consuming cars must be driven regularly to keep the battery charged.
B.
Our neighbor to the north, Canada, is both an importer and an exporter of petroleum products.
C.
The technology for electric vehicles has actually been around for many, many decades.
D.
Last but not least, plug-in hybrids emit less pollution and are better for our environment.