As T.A. said
Coral sea did not stop the Japanese, nor were they defeated there. Technically a tonnage victory for them.
Midway took precedence after that battle, but the main plan (attack Eastern Australia) was not abandoned because of Coral Sea.
Guadalcanal was Americas first offensive (in the Pacific) and was bitterly contested because both knew that the winner of that would have the "Offensive" momentum.
"Iron Bottom Sound" is not a contrived name.
Tarawa & Pelileu might fit together better, for results/benefits/cost.
Santa Cruise & Coral Sea might fit together better, for results/benefits/cost.
AS was said...Midway & Guadalcanal might fit together better for results/benefits/cost, for the correct-est answer.
As Iwo Jima & Okinawa seem to go hand in hand, again, as far as results/benefits/cost.

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There's one way to find out if a man is honest-ask him. If he says "Yes", you know he's a crook. Groucho Marx