What was the title of the first Rodgers and Hammerstein musical?

by Who Wants To Be A Millionaire?

In a Facebook poll of 63 respondents, 39.7% chose “D: Oklahoma!”. How we count

D: Oklahoma!
39.7%
A: The King and I
30.2%
B: Carousel
23.8%
C: South Pacific
6.3%
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