Students want to test gravity. They want to drop four objects with the same mass from the top of the bleachers they will time how long each object takes to reach the ground how can they improve confidence in their schools experiment

randomly slect the order in which the objects are dropped
let a differnt kid time the drop of each object
drop all four objects at once
drop each object 10 times and use the average of each fall times
I think its c am i correct?

To improve confidence in their experiment, students can follow option D, which is to drop each object 10 times and use the average of each fall time. This method, known as repeated trials, helps to reduce the impact of random errors and outliers by collecting more data points.

By dropping each object multiple times, the students can account for any variations in air resistance, human error in timing, or other external factors that might affect the results. Taking the average fall time of each object provides a more reliable representation of the time it takes for an object to reach the ground under the influence of gravity.

Therefore, option D is the best choice for increasing confidence in their experiment.