Final answer:
Chewing tobacco is the causative factor for developing Buerger's disease, as tobacco use is the primary risk factor associated with this condition.
Step-by-step explanation:
The client behavior that would be a causative factor for developing Buerger's disease (thromboangitis obliterans) is c. Chewing tobacco. Buerger's disease is strongly associated with tobacco use, which includes both smoking and the use of smokeless tobacco like chewing tobacco. Several studies and medical research indicate that tobacco use is a major risk factor as it can irritate and damage the endothelial cells lining the arteries, leading to the development of this condition.
Although other factors such as high blood pressure, diabetes mellitus, obesity, poor diet, and high blood cholesterol also contribute to cardiovascular diseases, in the case of Buerger's disease, tobacco use is the primary risk factor. Therefore, to reduce the risk of developing Buerger's disease, it is advised to quit tobacco in any form.