1. Concept used: Stability of diazonium salts

   Diazonium salts are generally of the form: $R-N_2^+X^-$

   There are two main cases:

   • Aliphatic diazonium salts: very unstable
   • Aromatic diazonium salts: relatively stable, especially when the diazonium group is attached to a benzene ring

   This is because in aryl diazonium salts, the diazonium group is stabilized by resonance with the aromatic ring, while alkyl diazonium salts decompose very easily.

2. Examine the given visible option

   Option A is: $CH_3-CH_2-CH_2-NH_2$ This is propylamine, an aliphatic primary amine.

   On diazotization, it would form an aliphatic diazonium salt, which is highly unstable.

3. General comparison

   Since the most stable diazonium salts are formed from aromatic primary amines such as aniline derivatives, the correct option must be the one corresponding to an aryl amine.

4. Issue with the provided options

   Only option A is visible in the question image/text. Options B, C, and D are missing. So the exact structure of option B cannot be checked directly from the prompt.

5. Using the stored answer

   The stored correct answer is B. This is consistent with the chemistry only if option B is the aromatic amine among the choices.

6. Conclusion

   • Option A is definitely not correct because it gives an unstable aliphatic diazonium salt.
   • The most stable diazonium salt should come from an aromatic primary amine.
   • Hence, accepting the provided key, the answer is B.

$\boxed{B}$