Benzene, which has a formula of C6H6, has a boiling point of 80.1°C. What is a possible new boiling point once an unknown amount of glucose is added to the benzene solvent? So remember we discussed this earlier on. We say the more solute you add to a pure solvent then the higher the boiling point would be.
So we're going to say here we expect the boiling point to be a value that is now higher than 80.1°C. And if we look at all our choices, the only one that's above this original temperature of 80.1°C is option C. We'd expect our temperature, which is reasonable, to be 89.6°C.
None of the other ones make any sense. Boiling point would not stay the same, and it definitely would not decrease. Adding solute to our pure solvent increases your boiling.