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 his or her classmates regarding a section of text they are all reading.
C) When a few students ask questions about things they don't understand,Ms. Cromwell asks if other students can answer the questions before answering them herself.
D) A few days before a test,Ms. Dievers has each student describe the strategies he or she plans to use while studying.