c
In the given molecule the number of lone pairs ( \(x\) ) is 6, number of sigma bonds (y) and number of \(\pi\) bonds \((\mathrm{z})\) are 6 and 1 respectively.
Hence \(\mathrm{x}+\mathrm{y}+\mathrm{z}=13\).
Hence the correct option is \(\mathrm{C}\).
