Please explain? Thanks!

In order to estimate the potential market size that might buy our new gardening app. we surveyed 300 people and found that 26 would pay for such an app. What is the 99% condence interval for the true proportion of people who would be interested? O a. (0.0448, 0.1205) 0 b.(0.0489, 0.1244) 0 c. (0.0547, 0.1186) 0 d. (0.0548, 0.1185)