In a Study of Smoking and Ovarian Cancer, a History

In a study of smoking and ovarian cancer, a history of smoking was strongly associated with one rare type of ovarian cancer (mucinous cancers) but not with any
Of the other more common types of ovarian cancer.This pattern of results suggests
(select the best option) :

A) The association with mucinous cancer is likely to be causal because it is specific for that type of ovarian cancer
B) The association between smoking and mucinous cancer is unlikely to be due to recall bias
C) The association with mucinous cancer is unlikely to be causal because there was no association with the other types of ovarian cancer
D) The association is unlikely to be causal because it is not plausible that smoking could affect the ovaries
E) None of the above