Which one of the following is an isobar of ${ }_6{\text{C}}^{14}$ ?

Isobar: The two nuclides of different elements which contain same atomic mass number (A) but different atomic numbers (Z) are called isobars.

Among the given species ${}_7\mathrm{N}^{14}$ is isobar with ${}_6\mathrm{N}^{14}$.