The breathing capacity of nonsmokers exposed to tobacco smoke on the job has been found to be significantly less than nonsmokers working in smoke-free environments, although unrestricted smoking at work is permitted by nearly 75 percent of all employers in the US.
(A) The breathing capacity of nonsmokers exposed to tobacco smoke on the job has been found to be significantly less than nonsmokers working in smoke-free environments, although
(B) The breathing capacity of nonsmokers exposed to tobacco smoke on the job has been found significantly less than nonsmokers working in smoke-free environments, however
(C) Although the breathing capacity of nonsmokers exposed to tobacco smoke on the job has been found significantly less than that of nonsmokers working in smoke-free environments, however
(D) Although the breathing capacity of nonsmokers exposed to tobacco smoke on the job has been found to be significantly less than that of nonsmokers working in smoke-free environments,
(E) Although the breathing capacity of nonsmokers exposed to tobacco smoke on the job has been found to be significantly less than nonsmokers working in smoke-free environments,