Which of the Following $\mathrm { C } - \mathrm { H }$

Which of the following $\mathrm { C } - \mathrm { H }$ bonds shows IR absorption at the lowest wavenumber? I.
II.

III. $\mathrm { C } - \mathrm { C } - \mathrm { H }$
IV. $\mathrm { C } = \mathrm { C } - \mathrm { H }$
V. $\mathrm { C } \equiv \mathrm { C } - \mathrm { H }$

A) I
B) II
C) III
D) IV
E) V