Which of the following sentences is correct? a. seven thousands of people showed up for the concert. b. he needed hundred of quilt squares for this project. c. does anyone know why steve ordered five dozens of eggs? d. she filled her living room with dozens of tulips.

The answer is D. "She filled her living room with dozens of tulips."

A is incorrect. It should either say "Seven thousand people showed up for the concert," or "Thousands of people showed up for the concert."

B is incorrect since hundred is used, and not the plural form, hundreds. The correct form would be: "He needed hundreds of quilt squares for this project."

C is also incorrect. The correct way to write the sentence would be: "Does anyone know why Steve ordered five dozen eggs?"