The incidence of cervical cancer has declined dramatically in Canada since the early 1970s. This is largely due to

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The best choice is C, women having regular Pap tests, as Pap tests can detect abnormal cells in the cervix before they turn cancerous, allowing for early treatment and prevention of cervical cancer. The other options, increased use of condoms and use of oral contraception, may have contributed to a decrease in some sexually transmitted infections that can lead to cervical cancer, but are not the main factors in the decline. The development of a blood test to determine presence of precancerous cells is not a proven method for detecting cervical cancer and is not widely used.

The Incidence of Cervical Cancer Has Declined Dramatically in Canada