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【单选题】
命题“存在x∈R，使得x 2 +2x+5=0”的否定是（ ）A.
存在x∈R，使得x 2 +2x+5≠0，
B.
不存在x∈R，使得x 2 +2x+5≠0
C.
对任意x∈R，x 2 +2x+5≠0
D.
对任意x∈R，x 2 +2x+5=0
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