Agnes Has Been Using XQuery to Design Queries Using Path

Multiple Choice

Agnes has been using XQuery to design queries using path expressions. Her next project will involve multiple source documents and require more complicated criteria. She has heard that a FLWOR structure could be effective for such cases, and comes to you for assistance in developing a FLWOR structure query.
-Agnes has heard that one of the clauses in a FLWOR structure defines a local variable that holds a single unchanged value. You tell her that she is describing the _____ clause.

A) for
B) let
C) where
D) return