The correct increasing order of $\mathrm{C}-\mathrm{H}(\mathrm{A})$, $\mathrm{C}-\mathrm{O}(\mathrm{B}), \mathrm{C}=\mathrm{O}(\mathrm{C})$ and $\mathrm{C} \equiv \mathrm{N}(\mathrm{D})$ bonds in terms of covalent bond length is: