End behavior of algebraic models

Given the graph that models a real world context, answer a question about the end behavior of the graph.

Problem

Initially, 5 students at Noa's school came down with the flu. As time, t, increased, the number of people, N, who came down with the flu increased rapidly, and then slowly approached 50.
Which of the following graphs could model this relationship?
Please choose from one of the following options.