Answer:
I belive it would be D
Step-by-step explanation:
 
        
             
        
        
        
Answer:
What question do we answer?
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
5 different numbers, 2 even
Step-by-step explanation:
Since we have 5 digits and they are non repeating we can use the permutation formula:

It gives us the amount of ways to arrange k objects out of n objects without repetition, but order does matter.
In our case the amount of 4 digit numbers that can be formed using the digits from 1 to 5 is: 
And out of those 5, only 2 are even
 
        
             
        
        
        
I believe the answer to be 60000 mg