Determine Whether the Study Depicts an Observational Study or an Experiment

Multiple Choice

Determine whether the study depicts an observational study or an experiment
-A scientist was studying the effects of a new fertilizer on crop yield. She randomly assigned half of the plots ona farm to group one and the remaining plots to group two. On the plots in group one, the new fertilizer wasused for a year. On the plots in group two, the old fertilizer was used. At the end of the year the average cropyield for the plots in group one was compared with the average crop yield for the plots in group two.

A) experiment
B) observational study