Which of the following shows the correct decreasing order of acidic character?

+I effect of CH3 group opposes the removal of H-atom of −C≡C−H as H+ in case of CH3 – C ≡C – H. In case of CH3 – C≡C – CH3, H-atom of C – H combination is a part of CH3 where C-atom is sp3-hybridised. The removal of H as H+ is very difficult.