We've often had threads about what evidence might de-convert a hard core HB to accepting the reality of the Moon Landings. However, I'd be interested in the hypothetical question [donning tinfoil hat now]:
What evidence would make you really doubt Apollo took place?
We also have to address the question of what is necessary evidence and what is sufficient evidence. For example, if some HB scientist found a way to manufacture absolutely convincing, fake moon rocks, in a way that could have been done in 1969, then one strand of evidence for Apollo is weakened. But the sum total of evidence is still standing.
The first 4 options in the Poll would be enough to turn me into a HB.