Which of the Following Refers to the Technique for Compliance

Which of the following refers to the technique for compliance that tells us that getting a person to sign a petition is the first step in getting the person to commit time or money for the passage of some legislation?

A) Foot-in-the-door technique
B) oaks-grow-from-acorns technique
C) door-in-the-face technique
D) planting-the-seed technique