1. Given data

   • Weight of body $= 200\,\text{N}$
   • Mass of chain $= 10\,\text{kg}$
   • $g = 10\,\text{m/s}^2$

2. Find the weight of the chain $W_{\text{chain}} = mg = 10 \times 10 = 100\,\text{N}$

3. Force exerted by the branch on the chain

   The branch supports:

   • the suspended body of weight $200\,\text{N}$
   • the chain itself of weight $100\,\text{N}$

   Therefore, the total downward force on the top of the chain is: $F = 200 + 100 = 300\,\text{N}$

4. Conclusion The branch pulls the chain upward with force $\boxed{300\,\text{N}}$

5. Option check

   • A: $300\,\text{N}$ ✅
   • B: $100\,\text{N}$ ❌
   • C: $150\,\text{N}$ ❌
   • D: $200\,\text{N}$ ❌

So, the correct option is A.