$32 \cdot 36$ Any permutation of the digits in the five-digit number 12345, the number of prime numbers obtained is
(A) 4 .
(B) 8 .
(C) 12 .
(D) 0 .
(Chinese Jiangsu Province Junior High School Mathematics Competition, 1986)
[Solution] Notice that $1+2+3+4+5=15$, which is divisible by 3. Therefore, regardless of the order of these digits, any five-digit number they form will be a multiple of 3, and thus not a prime number.

Hence, the answer is $(D)$.