Answer:
The correct answer is 12 M
Explanation:
A molar solution indicates the moles of solute (NaCl in this case) in 1 liter of solution (1000ml).
250 ml solution------3 moles of NaCl
1000ml solution-----x= (1000ml solutionx3 moles of NaCl)/250 ml solution
x=12 moles of NaCl---> 12 M