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【单选题】
研究人员对年龄在40岁至70岁的990人的电话采访和实验室化验结果进行分析发现：乐观者“坏”胆固醇(即低密度脂蛋白)高的可能性较低，而“好”胆固醇(即高密度脂蛋白)较高，这对心脏有保护作用．有助于抵消“坏”胆固醇。因此，研究认为这是心理健康与身体健康息息相关的又一证据．乐观的性情可能对人体健康有一些实实在在的好处。以下哪项如果为真．最能支持上述研究结论?
A.
目前该研究尚未发现乐观程度和总的胆同醇水平之间产生联系的原因
B.
乐观者的生活方式更为健康．这使得他们血液中的脂类与其他人群有差别
C.
被采访的乐观者中有大量运动爱好者，经常锻炼能使其患心脏病的风险降低
D.
实验中，乐观程度得分每增加5分，每100毫升血液中的高密度脂蛋白就增加l毫克，这意味着罹患心脏病的风险降低3％
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