Which molecule, when added to a solution, would give the solution the highest ph?

hcl
h2so4
koh
h2o

The molecule, when added to a solution, would give the solution the highest pH is KOH. This is because when KOH is in the solution, it will give a very strong basic properties due to the -OH and the K which is highly electropositive.

You know how the first one if filled up like the objects do the same but with the other categories

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.