The Common Allotropes of Carbon (Graphite and Diamond) Equilibrate as Follows

The common allotropes of carbon (graphite and diamond) equilibrate as follows: C(gr) ⇌ C(dia) with equilibrium constant K = 0.32. The molar volumes of graphite and diamond are, respectively, 5.30 cm³/mol and 3.42 cm³/mol; $\Delta$ H_f of diamond is 1.90 kJ/mol. This data suggests that the formation of diamond is favored at

A) low temperatures and low pressures
B) high temperatures and low pressures
C) low temperatures and high pressures.
D) high temperatures and high pressures.