The colon after "including" should be removed because "The introductory text in the sentence cannot stand alone"
<h3>What is a colon?</h3>
A colon is a punctuation mark (:) that is used to precede a list, quotation, or explanation.
The colon itself defines a list and hence the words like including are not necessary. Also, the sentence "I need to stop at several places, including: the bank, the grocery store, and the dry cleaners" consists of an introductory phrase hence the word including shall be removed since the introductory phrase cannot stand alone.
Therefore the correct option is b.
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