【单选题】

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. 21A．None

B．Ⅰ only

C．Ⅱ only

D．Ⅰ and Ⅱ only

E、Ⅰ, Ⅱ, and Ⅲ