Final answer:
Before becoming a novelist, Lloyd Douglas was a minister, drawing on his experiences for his writings, unrelated to the provided professional options.
Step-by-step explanation:
Before Lloyd Douglas started his career as a novelist, he served as a minister. Having been a pastor provided him with the life experiences that he often drew upon in his writings.
His work before becoming a novelist was not related to any of the professions listed in the options provided, which includes being a doctor, teacher, lawyer, or engineer. Notably, his narratives frequently intertwine themes of spirituality with the human experience.