the second one, because it is correct. If you are referring to a number of something, and the number is more than one: their.
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Three quarters of (this part of) a ton is too much. (not are)
3.6kms (so long a distance) is (never are) about 2 miles.
A third of the students (for example 2000 people) are from abroad.
One in three cars was/were dented.
Teleostomi(1)Only a few generations have been granted the role of defending freedom in its hour of maximum danger.The first sentence makes more sense since it was freedom that was in danger.
(2)Only a few generations have been granted the role of defending freedom in their hour of maximum danger.
Which sentence is better?