Which sentence demonstrates the most common and natural placement for the adverb 'instantly'?

Upon hearing her cry for help, he instantly rushed to her aid.

Upon hearing her cry for help, he rushed instantly to her aid.

Upon hearing her cry for help, instantly he rushed to her aid.

Instantly upon hearing her cry for help, he rushed to her aid.

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Which sentence demonstrates the most common and natural... | English MCQ #102 | Examora | Examora