Answer:
B. -2 
Explanation:
We have been given an expression 
 and we are asked to evaluate our expression, when P=-24 and Q=4.
 and we are asked to evaluate our expression, when P=-24 and Q=4.
Let us substitute P=-24 and Q=4 in our given expression.

Let us multiply 3 by 4. 


Upon dividing 24 by 12 we will get,

Therefore our expression simplifies to -2 and option B is the correct choice.