Which of the following amine(s) show(s) positive carbylamines test?

Choose the correct answer from the options given below :

The carbylamine test (also known as Hofmann's carbylamine test) is a specific chemical test used exclusively for the detection of primary ($$1^\circ$$) amines.

When a primary amine is heated with chloroform ($$\text{CHCl}_3$$) and alcoholic potassium hydroxide ($$\text{KOH}$$), it forms an isocyanide (carbylamine), which has an incredibly foul, offensive smell. Secondary ($$2^\circ$$) and tertiary ($$3^\circ$$) amines do not show this reaction.

$$\text{R-NH}_2 + \text{CHCl}_3 + 3\text{KOH} \xrightarrow{\Delta} \text{R-NC} \ (\text{Isocyanide}) + 3\text{KCl} + 3\text{H}_2\text{O}$$

Because only A and C are primary amines, they are the only ones that show a positive carbylamine test.