which sentence includes a restrictive clause?\no i often see my middle school english teacher shopping at…

which sentence includes a restrictive clause?\no i often see my middle school english teacher shopping at the mall.\no the english novelist charles dickens also wrote plays and articles.\no the ceramic cups birgit bought at the garage sale are all chipped.\no american literature, which we study in 11th grade, is my favorite subject.
Answer
Brief Explanations:
A restrictive clause is essential to the meaning of the sentence as it identifies the noun it modifies. In "The ceramic cups Birgit bought at the garage sale are all chipped", "Birgit bought at the garage sale" restricts which ceramic cups are being referred to. The other sentences either have no such restrictive element or have a non - restrictive clause (like "which we study in 11th grade" which is set off by commas and is non - essential).
Answer:
The ceramic cups Birgit bought at the garage sale are all chipped.