Question for 6th graders only which of the following is an example of a scientific experiment that is replicable?

Jenn is studying squirrel monkey behavior and records her observations about them while at the zoo.
Amelia is comparing how many sunflowers have grown this summer in her garden and her neighbor’s gardens.
Caroline is testing how well three different materials conduct electricity by measuring current.
Liz is investigating the rock cycle by researching the different types of rocks and soil in her area.