Use Hess's law and the following equations to calculate triangle H for the reaction SO2 (g) + NO2 (g) arrow SO3 (g) + NO (g). SO3(g) arrow SO2(g) + 1/2O2(g) traingleH=-98.4kJ/mol
1/2N2(g) + 1/2O2(g) arrow NO(g) triangleH=90.3 kJ/mol
NO2(g) arrow 1/2N2(g) + O2 (g) triangleH=-33.1 kJ/mol

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.