Because of wireless service costs plummeting in the last year, and as mobilePhones are increasingly common, many people now using their mobile phones to make calls across a wide region at night and on weekends, when numerousWireless companies provide unlimited airtime for a relatively small monthly fee.

A. Because of wireless service costs plummeting in the last year, and as
Mobile phones are increasingly common, many people.
B. As the cost of wireless service plummeted in the last year and as mobile
Phones became increasingly common, many people.
C. In the last year, with the cost of wireless service plummeting, and mobile
Phones have become increasingly common, there are many people.
D. With the cost of wireless service plummeting in the last year and mobile
Phones becoming increasingly common, many people are
E. While the cost of wireless service has plummeted in the last year and
Mobile phones are increasingly common, many people are.