Vector & Magnitude is (1,-9) & 9.0854 respectively! Correct option is 
D) (1, -9), 182 * 9.0854 
Explanation:
Here we have , We have to Identify the ordered pair that represents the vector from A(1,6) to B(2, -3) and the magnitude of AB . Let's find out:
Vector that represents from A(1,6) to B(2, -3) is given by :
⇒ 

⇒ 
 or ,
 or , 
⇒ 

Now , Magnitude of vector AB is :
⇒ 

⇒ 

⇒ 

⇒ 

⇒ 

Therefore , Vector & Magnitude is (1,-9) & 9.0854 respectively! Correct option is D) (1, -9), 182 * 9.0854