Identify the part of speech of the highlighted word.
Rakesh is bent upon having a fight with his neighbour.

Correct option is C

The correct answer is (c) Preposition.
• The highlighted word “upon” shows a relationship between bent and having a fight.
• It is used in the fixed expression “bent upon” (meaning determined to do something).
• A word that shows the relationship between words and links them is called a preposition.
Why other options are incorrect:
• Conjunction joins clauses/sentences (and, but, because), “upon” does not do that here.
• Noun is a naming word; “upon” is not a name.
• Pronoun replaces a noun; “upon” does not replace any noun.