Read the paragraph.The American Cancer Society sponsors research studies pertaining to preventing and treating cancer. In one long-term study, known as CPS-3, researchers took blood samples and health histories from over 300,000 volunteers. Researchers are following the volunteers for 40 years.
Answer
A
They help researchers raise money for new research programs.
B
They help researchers understand factors that prevent cancer.
C
They help researchers advocate for new cancer treatments.
D
They help researchers teach the public how to live longer.
Explanation
The researchers collected blood samples and health histories, then will track the volunteers for 40 years. Comparing this information over time can help researchers identify factors linked to preventing cancer. So the volunteers help researchers understand factors that prevent cancer.
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