people who often stay up too late are more likely to die of heart disease, a study.
A. with the help of
B. because of
C. according to
D. as a result.
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解析：
这题考查词组辨析：A. with the help of在帮助下B. because of因为C. according to根据D. as a result因此，句意是：根据一项调查，经常熬夜的人更可能死于心脏病。选C。