Assuming that the text is about heat-treatable alloys, which alternative correctly describes the difference between alloys that can and cannot be h...

Assuming that the text is about heat-treatable alloys, which alternative correctly describes the difference between alloys that can and cannot be heat-treated?

The text is about heat-treatable alloys.
The text explains the difference between alloys that can and cannot be heat-treated.
A - Those that can be heat-treated are alloys that can be hardened by cold plastic deformation, while those that cannot be heat-treated are normally solubilized and hardened by precipitation.
B - Those that can be heat-treated are alloys that can be hardened by cold plastic deformation, that is, by work hardening. Those that cannot be heat-treated are normally solubilized and hardened by precipitation.
C - Those that cannot be heat-treated are alloys that can be hardened by quenching. Alloys that can be heat-treated are normally solubilized and hardened by precipitation.
D - Those that can be heat-treated are alloys that can be hardened by quenching. Alloys that cannot be heat-treated are normally solubilized and hardened by precipitation.