A man is supporting a $100\,\text{N}$ load motionless in his hand. The total weight of the forearm and hand is $20\,\text{N}$. The forearm remains horizontal, as shown. What vertical force $F$ is required in the biceps?
- A$750\,\text{N}$
- B$800\,\text{N}$
- C$850\,\text{N}$
- D$900\,\text{N}$