Question

which sentence is correct? \add grapes, lemons, and lettuce to the grocery list.\ toby suggested. \add grapes, lemons, and lettuce to the grocery list,\ toby suggested.

Explanation:

When using a comma to introduce a quotation that is a complete sentence (like a suggestion here), we use a comma inside the closing quotation marks if the quote is part of a larger sentence. The second option uses a comma after "list" to properly integrate the quoted suggestion into the sentence "Toby suggested", while the first incorrectly uses a period inside the quote which would make the quoted part a separate sentence inappropriately.

Answer:

"Add grapes, lemons, and lettuce to the grocery list," Toby suggested.