Please explain

Q10. A system has two energy levels with energies e and 26. The lower level is 4-fold degenerate while the upper level is doubly degenerate. If there are N non-interacting classical particles in the system, which is in thermodynamic equilibrium at a temperature T, the fraction of particles in the upper level is 1 (a) 1+elkaT 1+2elkT 1 (C) (d) 2elk 4e2/k, 2eka+4e2e/kaT