Final answer:
The priest's dialogue in paragraph 19 builds suspense about the consequences of Mr. Obi's actions in the story's plot. Therefore, the correct option is A.
Step-by-step explanation:
The priest's dialogue in paragraph 19 of the story influences the plot by building suspense about the consequences of Mr. Obi's actions. Through the priest's words, the reader gets a sense of the potential trouble and negative outcomes that may arise from Mr. Obi's choices. This creates tension and anticipation, driving the plot forward and keeping the reader engaged.