Transfer molding is a process in which polymer resins are superheated, compressed in a charger, and then they are injected into a closed mold cavity; it is used to produce plastic moldings with variable wall thicknesses, as well as fine surface detail, such as the exterior panels of buses and trolleys.


1) molding is a process in which polymer resins are superheated, compressed in a charger, and then they are injected into a closed mold cavity; it is used to produce plastic moldings with variable wall thicknesses, as well as fine surface detail, such as the exterior panels of buses and trolleys

2) molding-a process in which superheated polymer resins are compressed in a charger, then injecting into a closed mold cavity-is used to produce plastic moldings, such as the exterior panels of buses and trolleys with variable wall thicknesses, as well as fine surface detail

3) molding-a process in which superheated polymer resins compressed in a charger are then injected into a closed mold cavity-it is used to produce plastic moldings, such as the exterior panels of buses and trolleys, with walls of variable thickness and surfaces of fine detail

4) molding, a process in which superheated polymer resins are compressed in a charger and then injected into a closed mold cavity, is used to produce plastic moldings, such as the exterior panels of buses and trolleys, with variable wall thicknesses and fine surface detail

5) molding is a process involving the compression of superheated polymer resins in a charger, and then they are injected into a closed mold cavity; this process, which is used to produce plastic moldings with variable wall thicknesses and fine surface detail, such as the exterior panels of buses and trolleys

OA is 4.

I have a doubt. Why option 5 is not correct? I think it is the best way to write that sentence. Experts, can you help me?