Can someone check my answer plz i think it is B THE FIRST PERSON WHO ANSWERS THIS WILL GET BRAIN LIST + thank u and 5 stars When geographers speak of “Pangaea,” they are referring to the idea that .

earthquakes and volcanoes cluster along the edges of the plates

all the continents are moving towards the North Pole

all the land masses will combine into one continent in the future

long ago Earth had only one huge continent

The authors of the paper "fudging the numbers: distributing chocolate influences student evaluations of an undergraduate course"† carried out a study to see if events unrelated to an undergraduate course could affect student evaluations. students enrolled in statistics courses taught by the same instructor participated in the study. all students attended the same lectures and one of six discussion sections that met once a week. at the end of the course, the researchers chose three of the discussion sections to be the "chocolate group." students in these three sections were offered chocolate prior to having them fill out course evaluations. students in the other three sections were not offered chocolate. the researchers concluded that "overall, students offered chocolate gave more positive evaluations than students not offered chocolate." indicate whether the study is an observational study or an experiment. give a brief explanation for your choice.