Which of the following sentences uses an adverb of frequency correctly?

Understanding the correct placement of adverbs of frequency is crucial for grammatical accuracy. Adverbs like 'rarely', 'always', 'often', and 'never' typically precede the main verb in a sentence.

• Option B: "I rarely go to the park" is correct because 'rarely' is placed before the main verb 'go', adhering to standard English grammar rules for adverbs of frequency.
• Option A: "Rarely I go to the park" is generally incorrect for a simple declarative sentence, as placing the adverb at the beginning is less common and often used for emphasis, requiring inversion in some cases.
• Option C: "I go rarely to the park" incorrectly places the adverb after the main verb.
• Option D: "Rarely go I to the park" uses an inverted structure that is ungrammatical and unnatural for this type of statement.