The comma should be in, "Trimming the front hedges, Dad."
The comma is a punctuation mark used to separate sentences.
Because a comma is used to separate the introductory phrase from the main clause, the comma gives a brief pause and sets apart the additional information in a sentence. While trimming the front hedges, Dad accidentally slipped. The comma sets apart the introductory phrase from the contextual phrase.
Hence the correct option is, "Trimming the front hedges, Dad"
To know more about the comma:
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