单项选择题

If the lengths of two of the sides of a triangle are 9 and 10, which of the following could be the length of the third side
Ⅰ. 1
Ⅱ. 11
Ⅲ. 21

A．None
B．Ⅰ only
C．Ⅱ only
D．Ⅰ and Ⅱ only
E． Ⅰ, Ⅱ, and Ⅲ

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单项选择题