which underlined phrase is a prepositional phrase?\no test - takers were asked not to use their notes…

which underlined phrase is a prepositional phrase?\no test - takers were asked not to use their notes, books, or calculators.\no before passing out the test, the teacher asked students to close their books.\no neither of the tests this week had questions about the pythagorean theorem.\no the teacher and the students thought that the test took longer than expected.
Answer
Answer:
B. Before passing out the test
Brief Explanations:
A prepositional phrase starts with a preposition. "Before" is a preposition in "Before passing out the test". The other under - lined phrases do not start with prepositions.