JEE Main 2020 — Chemistry in Everyday Life Question with Solution

A chemist has $4$ samples of artificial sweetener $\mathrm{A},\mathrm{}\mathrm{B},\mathrm{}\mathrm{C}$ and $\mathrm{D}$ . To identify these samples, he performed certain experiments and noted the following observations:
(i) $\mathrm{A}$ and $\mathrm{D}$ both form blue-violet colour with ninhydrin.
(ii) Lassaigne extract of $\mathrm{C}$ gives positive ${\mathrm{A}\mathrm{g}\mathrm{N}\mathrm{O}}_3$ test and negative $\mathrm{F}{\mathrm{e}}_4{\left[\mathrm{F}\mathrm{e}{\left(\mathrm{C}\mathrm{N}\right)}_6\right]}_3$ test.
(iii) Lassaigne extract of $\mathrm{B}$ and $\mathrm{D}$ gives positive sodium nitroprusside test.
Based on these observations which option is correct?