Final answer:
Option (B), The paragraph describes the phase of rising action in the plot, showcasing Rahman's deepening bond with Mini as an important event leading up to the story's climax.
Step-by-step explanation:
The part of the plot further developed by the explanation in the paragraph indicating Rahman's diligent visits to Mini, despite being busy collecting debts, is B) Rising Action. This phase in storytelling involves the characters encountering conflicts and setting out on journeys, which in this case, can be seen as Rahman's emotional journey and the formation of a bond with Mini that defies his normal routine.
Rising action creates tension and builds up to the climax of the story by showing the nuances in characters' relationships and hinting at the significance of these developments to the overall narrative.