In organic chemistry, complete hydrolysis of a nonapeptide gave 3 ala, 2 phe, 2 asp,

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gly and ser. Reaction of? the nonapeptide with Sanger's reagent (1-fluoro-2,4-dinitrobenzene) followed by the hydrolysis gave N-(2,4-dinitrophenyl) alanine. Partial hydrolysis of the nonapeptide gave the following fragments:
gly-ala-phe
ala-asp-gly-ala
phe-ser-ala
ser-ala-phe-asp

Which one of the following is the nonapeptide's primary structure?

A) ala-asp-gly-ala-asp-ala-phe-ser-phe

B) ala-phe-asp-gly-ala-asp-ser-phe-ala

C) ala-asp-gly-ala-phe-ser-ala-phe-asp

D) gly-ala-phe-ser-ala-phe-asp-asp-ala
 
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