Answer: D. "Actions speak louder than words."
Explanation: Clara Luper believed in taking tangible actions to bring about change rather than relying solely on words or empty promises. She actively participated in various civil rights protests and movements, including the historic sit-ins that took place in Oklahoma City in the 1950s and 1960s. These sit-ins were peaceful demonstrations held at segregated lunch counters, where African Americans would sit and wait to be served, challenging the discriminatory policies of the time.