AMC 8 1995 Problem 23

How many four-digit whole numbers are there such that the leftmost digit is odd, the second digit is even, and all four digits are different? $\text{(A)}\ 1120 \text{(B)}\ 1400 \text{(C)}\ 1800 \text{(D)}\ 2025 \text{(E)}\ 2500$