单选题 Every year millions of women are screened with X - rays to pick up signs of breast cancer. If this happens early enough, the disease can often be treated successfully. According to a survey published last year, 21 countries have screening programmes. Nine of them, including Australia, Canada, the US and Spain, screen women under 50.
But the medical benefits of screening these younger women are controversial, partly because the radiation brings a small risk of inducing cancer. Also, younger women must be given higher doses of X -rays because their breast tissues is denser.
What will happen if breast cancer is diagnosed early enough?

• A. It will be treated successfully.
• B. It will still develop to be fatal.
• C. It will recover without medical treatment.
• D. it will not recover even with medical treatment.