Step 1: Concept
Dinitrogen ($N_2$) is a non-polar homonuclear diatomic molecule.
Step 2: Analysis
- Since $N_2$ is non-polar, it does not have a permanent dipole.
- Non-polar molecules interact via temporary dipoles, known as London dispersion forces or Van der Waals forces.
Step 3: Conclusion
Thus, the primary force involved is the London dispersion force.
Final Answer: (C)