Researchers have observed that women who wear bras for more than 16 hours a day are more likely to develop breast cancer than those who spend less time in a bra. In other words, there is a correlation between wearing a bra and breast cancer

Based on this finding, which of the following statements is true?
a. Wearing a bra causes cancer.
b. All women should avoid wearing a bra for more than 16 hours a day.
c. There is no relationship between wearing a bra and breast cancer; these data are clearly flawed.
d. Some additional variable may serve to explain the relationship observed between wearing a bra and developing cancer.

d. Some additional variable may serve to explain the relationship observed
between wearing a bra and developing cancer.