ජීවීන්ගේ ස්වභාවය ස්ථාවරතාවය හානිවන්නට අනුක ස්කන්ධයේ අඛණ්ඩතාවය යනු

The question asks for the combination of basic elements that constitute approximately 96.3% of the human body's mass.

The four most abundant elements by mass in the human body are Oxygen (O), Carbon (C), Hydrogen (H), and Nitrogen (N).

• Oxygen (O): ~65%
• Carbon (C): ~18%
• Hydrogen (H): ~10%
• Nitrogen (N): ~3% These sum up to approximately $65\% + 18\% + 10\% + 3\% = 96\%$, which is consistent with the 96.3% mentioned in the question.

1. O, C, H, P (Phosphorus is not one of the top four most abundant elements by mass)
2. O, C, H, S (Sulfur is not one of the top four most abundant elements by mass)
3. C, H, N, P (Missing Oxygen, which is the most abundant element)
4. O, C, H, N (This option includes Oxygen, Carbon, Hydrogen, and Nitrogen, which are the four most abundant elements)
5. O, C, H, Ca (Calcium is a major mineral, but Nitrogen is more abundant than Calcium in terms of overall body mass percentage among the top four)

Option 4 correctly lists the four elements (O, C, H, N) that make up about 96.3% of the human body's mass.

The final answer is $\text{4. O,C,H,N}$.