It's "C". Why? At 250 Kts IAS there is more ram air and therefore more power. "C" was further south and higher on less fuel than "A" & "B". More compression (ram) means more power.
No doubt you climb faster, but since TAS & GS are greater, your rate of turn (assuming same bank angle) is less, time & distance traveled is greater, and total trip distance is greater.
So the "more power" aspect is fighting the physical facts of more time and distance. And you don't get "more power" except by burning more fuel. Perhaps "C"
is correct, but not by much.
(Although - I certainly can sympathize with a Canadian hurrying to fly south...)
