one moleculetwo moleculesone moletwo moles of H2(g) reacts with one moleculetwo moleculesone moletwo moles of F2(g) to form one moleculetwo moleculesone moletwo moles of HF(g).

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.

The answer is c - the principal of original lateral continuity.