Answer: Option B
To determine the correct preposition to use in the sentence, it is important to understand the meanings of the prepositions given as options.

• "With" indicates being in the company of something or someone or having something. It is not appropriate in the context of the sentence.
• "Of" is used to indicate a relationship between things or people, and it often implies possession or belonging. In the context of the sentence, it makes sense to use "of" because it indicates that Pakistan is not in possession or does not have an affinity for the bomb for its own sake.
• "For" is used to indicate the purpose of something or the intended recipient of an action. In the context of the sentence, it is not appropriate to use "for" as it does not convey the intended meaning.
• "By" is used to indicate the person or thing that performs an action. In the context of the sentence, it does not make sense to use "by" as it does not convey the intended meaning.
• "None of these" is not the correct answer in this case, as "of" is the most appropriate preposition to use.

In the sentence, the word "enamoured" means to be fond of or to have a liking for something. Therefore, the sentence means that Pakistan is not fond of or does not have a liking for the bomb for its own sake.
Formulae:

• "With" indicates being in the company of something or someone or having something.
• "Of" is used to indicate a relationship between things or people, and it often implies possession or belonging.
• "For" is used to indicate the purpose of something or the intended recipient of an action.
• "By" is used to indicate the person or thing that performs an action.

In conclusion, the most appropriate preposition to complete the sentence is "of".