In the given sentence, choose the option which correctly identifies the part of speech of the highlighted word.
He should either work hard or leave the job.

Correct option is D

The correct answer is (d) Conjunction.
• Explanation for choosing the correct answer:
In the sentence, the word either is used with or to connect two alternatives: work hard and leave the job. Such paired words are used to join words or clauses and show a choice between them.
• Grammatical rule involved (English):
Either…or is a pair of correlative conjunctions. Conjunctions are words that join words, phrases, or clauses and show a relationship between them.
• व्याकरण नियम (Hindi):
Either…or को correlative conjunction कहा जाता है। Conjunction वे शब्द होते हैं जो दो शब्दों या वाक्यांशों को जोड़ते हैं और उनके बीच संबंध बताते हैं।
• Meanings / role of the other options:
• (a) Adverb: Does not modify a verb or adjective here.
• (b) Pronoun: Does not replace a noun.
• (c) Preposition: Does not show relation between a noun and another word.
Thus, the correct option is (d) Conjunction.