The diagram depicts two fixed pins, Y and Z. A length of elastic is stretched from Y to Z and passes around pin X, which is attached to a trolley. X is positioned at the midpoint of the elastic, and the trolley is to be driven in direction P at right angles to YZ. The tension in the elastic is $4\,\text{N}$. What force accelerates the trolley in direction P when the trolley is released?
- A$2.4\,\text{N}$
- B$3.2\,\text{N}$
- C$4.8\,\text{N}$
- D$6.4\,\text{N}$