Incorrect statement about the plot is/are:
A. `T_(1) and T_(2)` are melting point and boiling point of Mg repectively.
B. `T_(1) and T_(2)` are melting point and boiling point of MgO repectively.
C. Reducing of MgO by coke is possibe above `T_(3)`.
D. Mg can be extracted from gaseous products by rapid cooling.
