A 90% Confidence Interval for the Mean Percentage of Airline

Multiple Choice

A 90% confidence interval for the mean percentage of airline reservations being canceled on the day of the flight is (1.5%, 4.2%) . What is the point estimator of the mean percentage of reservations
That are canceled on the day of the flight?

A) 2.85%
B) 1.35%
C) 2.7%
D) 2.10%