We can easily narrow down the correct answer to "none of the above", which leaves 5 or 6. But since 5 is above 6 and is a correct answer, 6 cannot be correct. S

We can easily narrow down the correct answer to "none of the above", which leaves 5 or 6. But since 5 is above 6 and is a correct answer, 6 cannot be correct. So it must be 5.