问题
单项选择题
The product of the two-digit numbers above is the three-digit number □◇□, where □, △, and ◇, are three different nonzero digits. If □×△＜10, what is the two-digit number □△ ？（）
A.11
B.12
C.13
D.21
E.31
答案
参考答案：D