A paramagnetic material has 10²⁸atoms/m³. Its magnetic susceptibility at temperature 350K is 2.8×10⁻⁴. Its susceptibility at 300K is:
a. 3.726×10⁻⁴
b. 2.672×10⁻⁴
c. 3.267×10⁻⁴
d. 3.672×10⁻⁴