11. Two three-digit numbers have the same digits in each place, but their order is exactly reversed. It is known that the product of these two three-digit numbers is 433755. Then, the tens digit of the three-digit number is ( ).
(A) 1
(B) 5
(C) 6
(D) 7
(E) None of the above answers is correct
11. (C) The unit digit of a number is 5, and its hundred's digit is an odd number. If this odd number is 9, the product will exceed 450000; if it is less than or equal to 5, the product will be less than 360000. Therefore, the hundred's digit is 7. Let the ten's digit be $x$, then (5 $+7) x+3$ will yield the ten's digit of the product as 5, so $x$ is 1 or 6. At this point, it is easy to make the correct judgment.