The first and last are good.
In the first, the subject is cost, and that cost is rising.
In the last, the subject is rise, and we are told that the rise that occurred is in cost.
There's a subtle meaning difference here. In the first, the rising cost is the cause, while in the last, the rise itself is the cause. In this context, there's not much difference between those two meanings, but in other situations, the difference might be crucial.
The second one doesn't work idiomatically--we'd never
...
In the first, the subject is cost, and that cost is rising.
In the last, the subject is rise, and we are told that the rise that occurred is in cost.
There's a subtle meaning difference here. In the first, the rising cost is the cause, while in the last, the rise itself is the cause. In this context, there's not much difference between those two meanings, but in other situations, the difference might be crucial.
The second one doesn't work idiomatically--we'd never
...
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