Which One of the Following Teachers Is Using Reciprocal Teaching

Which one of the following teachers is using reciprocal teaching?

A) Mr. Armando has students work in pairs, testing each other's knowledge about a topic.
B) Working with a small group, Mr. Bromley gives each student a chance to ask questions of other group members regarding a section of text they are reading.
C) When students ask questions about things they don't understand, Ms. Cromwell asks if classmates can answer those questions before answering them herself.
D) Before a test, Ms. Dievers has each student describe the strategies he or she plans to use while studying.