Which One of the Following Statements Is True Concerning the Ratio

Multiple Choice

Which one of the following statements is true concerning the ratio of the molar heat capacities Cp/Cᵥ for an ideal gas?

A) The ratio is always 1.
B) The ratio is always less than 1.
C) The ratio is always greater than 1.
D) The ratio is sometimes less than 1.
E) The ratio is sometimes greater than 1.