Select the correct text in the passage. The US is clearing landmines in Angola so people are not maimed by exploding ordinance.

What principle and values does this effort support from the Mission Statement of the US Department of State?

The Department's mission is to (shape and sustain a peaceful, prosperous, just, and democratic world) and foster conditions for stability and progress for the (benefit of the American) people and people everywhere. This mission is shared with the USAID, ensuring (we have a common path forward) in partnership as we invest in the shared security and prosperity that will ultimately (better prepare us for the challenges of tomorrow.)

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.