Take another look at the sentence:
Filling the shopping cart with D batteries and bottled water, the completion
of our hurricane preparation soothed our anxiety.
Filling the shopping cart with D batteries and bottled water, a participle phrase, comes right before completion, an illogical target. People, not completion, have the money to spend on supplies! Before you continue, review the rules for misplaced and dangling modifiers.
Go back to the sentence to try again.