Final answer:
Aimee Semple McPherson's ministry in the 1920s was effective because she understood American culture and used it as a bridge to the understanding of the gospel.
Step-by-step explanation:
The effectiveness of Aimee Semple McPherson's ministry in the 1920s can best be explained by option d) She understood American culture and used it as a bridge to the understanding of the gospel.
McPherson was able to reach a large audience by blending Hollywood style and modern technology with her message of fundamentalist Christianity. She held radio-broadcast services in large venues that resembled concert halls and staged spectacular faith-healing performances.
By understanding American culture and using it as a bridge, McPherson was able to appeal to a wide range of people and gain popularity for her ministry.