Which of the following factors can contribute to the development of cancer?

The factor contributing to the development of cancer among the choices provided is exposure to benzene. Benzene is a known carcinogen, which means it has been shown to cause cancer in humans. This chemical is commonly encountered in various industrial settings, such as oil refineries and chemical plants, as well as in some household products and cigarette smoke. Long-term exposure to benzene can lead to hematological malignancies, including leukemia. Understanding the link between carcinogenic exposures and cancer development is crucial in prevention efforts and public health strategies.

In contrast, regular exercise, maintaining a healthy weight, and eating organic foods are associated with positive health outcomes and often reduce the risk of developing various types of cancer. Regular exercise can help regulate body weight, improve immune function, and reduce inflammation—all factors that contribute to cancer prevention. Maintaining a healthy weight is also vital, as obesity is linked to increased risks of several cancers. On the other hand, while eating organic foods can have various benefits, the term "organic" primarily refers to farming practices rather than cancer prevention. Therefore, the link between benzene exposure and cancer allows it to stand out as the correct answer in this context.