Identify the part of speech of the highlighted word.
Jogging is a not good exercise, especially for the senior citizens.

Correct option is B

Correct answer: (b) Adverb
Important note (sentence correction):
• The correct sentence should be: Jogging is not a good exercise, especially for senior citizens.
• Here, the highlighted word is “not” (negative marker), which functions as an adverb.
Meaning of “not” (in detail):
• not → used to make a sentence negative; “no/never” sense (Hindi: नहीं)
Why it is an Adverb (in detail):
• An adverb modifies a verb/adjective/another adverb.
• Here “not” modifies the adjective phrase “a good” (i.e., it negates “good”).
Example: He is not happy. (not modifies happy)
Grammatical rule (English):
• Not is a negative adverb used to negate verbs/adjectives.
व्याकरणिक नियम (Hindi):
• “not (नहीं)” एक नकारात्मक क्रिया-विशेषण (negative adverb) है जो verb/adjective को negate करता है।
Meanings of other options (why incorrect):
• (a) Verb → action word (run, eat).
• (c) Noun → name of person/place/thing.
• (d) Conjunction → joins clauses (and, but).
Hence, option (b) is the correct answer.