Answer:
Carly withdraws $18 from her bank account. 
 
We assume that Carly has $x in her account. She withdraws $18 from her bank account. 
 
So we have to subtract $18 from $x amount. 
 
Which is $x - 18. 
 
So we are subtracting $18 from her account. 
 
It should be represented by an integer -18. 
 
Now we have to identify the which number line represents -18. 
 
It is D)
Explanation: