Which part of the sentence uses description to hold the reader’s interest?
returning home from the trip
we peeled off our sodden coats
dropped all our suitcases on the floor
and headed for the kitchen in the back

Returning home from the trip

But could be almost any part of the sentence.

Explanation:

The answer to this really is in the head of the person who made it up. Normally it is the modifier at the beginning. Where have they been? What have the done? How long were they away?

But other questions loom. Why are they so interested in the kitchen? Why are they so hungry? Why are they so wet?

I'm going to pick the usual answer (Returning home from the trip) but the other parts are well written as well and it is hard to know what to pick.

summary - a brief statement or account of the main points of something.

main idea - the main idea is defined as the main point of a speech or piece of writing.

paragraph - a distinct section of a piece of writing, usually dealing with a single theme and indicated by a new line, indentation, or numbering.

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explanation: