Beam QR is supported in place by wire PQ. This arrangement is used to make a crane that carries a stationary load of $4.0\,\text{kN}$, as illustrated. What force does the beam QR exert on point Q?
- A$4.0\,\text{kN}$
- B$4.6\,\text{kN}$
- C$6.9\,\text{kN}$
- D$8.0\,\text{kN}$