Form a seven-digit number without repeated digits using the seven numbers $1,2,3,4,5,6,7$, where the two even numbers are adjacent, and the four odd numbers are not all adjacent. The number of such seven-digit numbers is
(A) 432
(B) 720
(C) 144
(D) 576
2. (A).

There are $3 \times 3! \times 4! = 432$ in total.