After returning to camp, Dr. Alfons and the explorers plan their route for the next day of exploration

/in /by

After returning to camp, Dr. Alfons and the explorers plan their route for the next day of exploration  Is this set of an introductory clause, phrase, or Set off non-restrictive modifier modifying words that could be removed without loss of meaning Separates coordinates, adjectives adjectives that independently, modify the same noun Separate items in a series Join two main clauses

 
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