Drinking beetroot(甜菜) juice before exercise could take years off your brain. Combining the drink with exercise strengthens certain regions of the brain, making it appear more youthful and potentially preventing the organ’s decline. This finding could help people who are at the risk of brain deterioration(恶化) to remain functionally independent, such as those with a family history who have suffer from the brain damage. Beetroot juice’s power likely lies in its nitric oxide content(一氧化氮含量), which both increases blood flow to the brain and improves exercise performance. 
       Study author Professor Jack Rejeski said, “Nitric oxide is a really powerful material. It goes to the areas of the body which need oxygen, and the brain is a heavy feeder of oxygen in your body. Compared to exercise alone, adding a beetroot juice supplement to exercise resulted in brain improvement that closely resembles what you see in younger adults.”
       Scientists from Wake Forest University, North Carolina, studied 26 men and women aged 55 and older who did not exercise and had high blood pressure. Some participants were given beetroot juice one hour before walking for 50 minutes without having a rest, while others did the same exercise but without the drink. This was repeated three times a week for six weeks. Those who drank the juice had healthier brains, including the regions involved in movement, emotion and cognitive function.  
       The scientists also found higher levels of nitrate(硝酸盐) in those who drank the juice. Beetroot contains nitrate, which is first turned to nitrite and then nitric oxide in the body. This comes after researchers from Queen Mary University of London found one daily glass of 250ml beetroot juice lowers blood pressure.

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1. What does the underlined phrase “This finding” refer to?（词义猜测）

A    The benefits drinking beetroot brings in.

B    Certain regions of the brain growing large.

C    Drinking a lot of water before exercise.

D    Preventing the organ's decline is impossible.